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kubeadm: Drop arch suffixes

**What this PR does / why we need it**:

This change removes arch suffixes from control plane images (etcd, kube-apiserver, kube-scheduler, kube-proxy, etc.). These are not needed, as almost all control plane images have a fat manifest now. It also adds a missing unit test for `GetGenericImage`

We have arch suffixes only for kube-dns images now.

Sample output of `kubeadm config images pull` with this change:

```
$ ./_output/bin/kubeadm config images pull
[config/images] Pulled k8s.gcr.io/kube-apiserver:v1.11.1
[config/images] Pulled k8s.gcr.io/kube-controller-manager:v1.11.1
[config/images] Pulled k8s.gcr.io/kube-scheduler:v1.11.1
[config/images] Pulled k8s.gcr.io/kube-proxy:v1.11.1
[config/images] Pulled k8s.gcr.io/pause:3.1
[config/images] Pulled k8s.gcr.io/etcd:3.2.18
[config/images] Pulled k8s.gcr.io/coredns:1.1.3
$ ./_output/bin/kubeadm config images pull --feature-gates=CoreDNS=false
[config/images] Pulled k8s.gcr.io/kube-apiserver:v1.11.1
[config/images] Pulled k8s.gcr.io/kube-controller-manager:v1.11.1
[config/images] Pulled k8s.gcr.io/kube-scheduler:v1.11.1
[config/images] Pulled k8s.gcr.io/kube-proxy:v1.11.1
[config/images] Pulled k8s.gcr.io/pause:3.1
[config/images] Pulled k8s.gcr.io/etcd:3.2.18
[config/images] Pulled k8s.gcr.io/k8s-dns-kube-dns-amd64:1.14.10
[config/images] Pulled k8s.gcr.io/k8s-dns-sidecar-amd64:1.14.10
[config/images] Pulled k8s.gcr.io/k8s-dns-dnsmasq-nanny-amd64:1.14.10
```

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Refs kubernetes/kubeadm#1030 kubernetes/kubeadm#51

**Special notes for your reviewer**:
/cc @kubernetes/sig-cluster-lifecycle-pr-reviews
/area kubeadm
/kind feature
/assign @luxas
/assign @timothysc
/assign @dims 
/assign @neolit123 

**Release note**:

```release-note
kubeadm: Control plane images (etcd, kube-apiserver, kube-proxy, etc.) don't use arch suffixes. Arch suffixes are kept for kube-dns only.
```

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Tests: Make e2e test platform-agnostic

The test:
[k8s.io] Pods should support remote command execution over websockets [NodeConformance]

  uses cat on /etc/resolv.conf and checks if the output from the container is  "namespace",
which is incompatible with windows containers as there is no such file.

  Since the test just check if remote command execution works, the command is
irrelevant as long as the output checks out. Switched to using echo "remote execution test",
and checking that output as it works for both windows and linux.

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Honor --hostname-override, report compatible hostname addresses with cloud provider

xref #67714

7828e5d0 made cloud providers authoritative for the addresses reported on Node objects, so that the addresses used by the node (and requested as SANs in serving certs) could be verified via cloud provider metadata.

This had the effect of no longer reporting addresses of type Hostname for Node objects for some cloud providers. Cloud providers that have the instance hostname available in metadata should add a `type: Hostname` address to node status. This is being tracked in #67714

This PR does a couple other things to ease the transition to authoritative cloud providers:
* if `--hostname-override` is set on the kubelet, make the kubelet report that `Hostname` address. if it can't be verified via cloud-provider metadata (for cert approval, etc), the kubelet deployer is responsible for fixing the situation by adjusting the kubelet configuration (as they were in 1.11 and previously)
* if `--hostname-override` is not set, *and* the cloud provider didn't report a Hostname address, *and* the auto-detected hostname matches one of the addresses the cloud provider *did* report, make the kubelet report that as a Hostname address. That lets the addresses remain verifiable via cloud provider metadata, while still including a `Hostname` address whenever possible.

/sig node
/sig cloud-provider

/cc @mikedanese

fyi @hh

```release-note
NONE
```

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Remove incorrect glog error from Horizontal Pod Autoscaler Controller.

**What this PR does / why we need it**:
Pro removes  incorrect glog error from Horizontal Pod Autoscaler Controller.

**Release note:**
```release-note
none
```

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return err when Unmarshal failed

**What this PR does / why we need it**:
return err when Unmarshal failed
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

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Add "sample-plugin" staging repo

Supersedes https://github.com/kubernetes/kubernetes/pull/67729

Showcases usage of the new `kubectl` plugins mechanism.
Showcases usage of the new `cli-runtime` repo from a third-party plugin

See README.md for details on what this plugin actually does.

/assign @smarterclayton @sttts @juanvallejo 

/sig cli

**Release note**:
```release-note
Adds sample-cli-plugin staging repository
```

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Work on Juju charms:CSI, dyn config, cloud integration

**What this PR does / why we need it**: This PR updates the Juju charms with fixes/additions regarding. CSI, cloud integration, dynamic configs and cdk-addons

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

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Revert "Re-calibrate load test throughputs"

This reverts commit 2f7f6dee.

/cc @wojtek-t 

```release-note
NONE
```

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Size http2 buffers to allow concurrent streams

http/2 requests from a given client multiplex over a single connection via streams, chopped up into frames.

The amount of data the client is allowed to send for a given stream and for the overall connection before acknowledgement is determined by the server's MaxUploadBufferPerStream and MaxUploadBufferPerConnection settings respectively, both defaulting to 1MB.

The number of concurrent streams a client is allowed to send over a single connection is determined by the server's MaxConcurrentStreams setting, defaulting to 250.

We observed a starvation issue with the kube aggregator's proxy client if handling of a POST through the aggregator to a backend server exceeded the 1MB buffer size AND the backend server required a second POST request through the aggregator to be handled before it could drain the first request's body.

Logically, if concurrent streams are allowed in a single connection, the connection buffer should be MaxUploadBufferPerStream*MaxConcurrentStreams to allow individual streams to make progress even when one stream is blocked.

This PR shrinks the `MaxUploadBufferPerStream` size to 256kb (which is still large enough to allow all the resources we saw in our test clusters to be sent in a single frame), and grows the MaxUploadBufferPerConnection to accomodate concurrent streams.

I'm also opening a golang issue, [reproducer](https://gist.github.com/liggitt/00239c99b4c148ac1b23e57f86b3af93), and fix for the defaults for this

```release-note
adjusted http/2 buffer sizes for apiservers to prevent starvation issues between concurrent streams
```

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SCTP support implementation for Kubernetes

**What this PR does / why we need it**: This PR adds SCTP support to Kubernetes, including Service, Endpoint, and NetworkPolicy.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #44485

**Special notes for your reviewer**:

**Release note**:

```release-note

SCTP is now supported as additional protocol (alpha) alongside TCP and UDP in Pod, Service, Endpoint, and NetworkPolicy.  

```

Merge pull request #67694 from sttts/sttts-kube-apiserver-always-create-extension-apiserver-authentication

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kube-apiserver: always create configmap/extension-apiserver-authentication

Other components (aggregated apiservers) read the configmap and fail hard if it does not exist. But they work without all fields being set (https://github.com/kubernetes/kubernetes/pull/66394). In the future, components like ctrl-manager and scheduler won't need kube-apiserver to authenticate with them at all. So, consequently we should always create the file, even if it is empty.

```release-note
Always create configmaps/extensions-apiserver-authentication from kube-apiserver.
```

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fix typo in runtime conversion.go

**What this PR does / why we need it**:
Fix typo in runtime conversion.go in function `Convert_Slice_string_To_bool`

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #
NONE 

**Special notes for your reviewer**:
NONE 

**Release note**:

```release-note
NONE
```

This reverts commit 2f7f6dee.

Signed-off-by: Rostislav M. Georgiev <rostislavg@vmware.com>

This change removes arch suffixes from control plane images (etcd,
kube-apiserver, kube-scheduler, kube-proxy, etc.). These are not needed, as
almost all control plane images have a fat manifest now.

We have arch suffixes only for kube-dns images now.
Signed-off-by: Rostislav M. Georgiev <rostislavg@vmware.com>

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Move kubeproxy ComponentConfig external types to `k8s.io/kube-proxy`

**What this PR does / why we need it**:
This PR implements most of kubernetes/community#2354 for the kube-proxy.
The PR:
- Moves k8s.io/kubernetes/pkg/proxy/apis/kubeproxyconfig as-is to k8s.io/kubernetes/pkg/proxy/apis/config as agreed
- Moves the external types to the new staging repo k8s.io/kube-proxy, in the k8s.io/kube-proxy/config/v1beta1 package.
- Makes k8s.io/kubernetes/pkg/proxy/apis/config/v1beta1 source the types from k8s.io/kube-proxy/config/v1beta1. The defaulting and conversion code is kept in this package as before.
- All references to these packages have been updated.

Ref #67233

**Special notes for your reviewer**:

**Release note**:
```release-note
kube-proxy v1beta1 external ComponentConfig types are now available in the `k8s.io/kube-proxy` repo
```

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GCE: Add ListLocations to Cloud TPU API

Add ListLocations to Cloud TPU API.

**Release note**:

```release-note
None
```

/assign @vishh 
/assign @MrHohn
for approval.

Automatic merge from submit-queue (batch tested with PRs 64597, 67854, 67734, 67917, 67688). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

fix an issue that scheduling doesn't respect NodeLost status of a node

**What this PR does / why we need it**:

- if Node is in UnknowStatus, apply unreachable taint with NoSchedule effect
- some internal data structure refactoring
- update unit test

**Which issue(s) this PR fixes**:
Fixes #67733, and very likely #67536

**Special notes for your reviewer**:

See detailed reproducing steps in #67733.

**Release note**:
```release-note
Apply unreachable taint to a node when it lost network connection.
```

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Remove unused kubelet dependency

**What this PR does / why we need it**:
Cleanup unused `ExternalKubeClient`. I think it's a vestige of when the Kubelet still used the internal types.

**Release note**:
```release-note
NONE
```

/kind cleanup
/sig node
/assign @mtaufen

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Allow ImageReview backend to add audit annotations.

**What this PR does / why we need it**: 
This can be used to create annotations that will allow auditing of the created 
pods.

The change also introduces "fail open" audit annotations in addition to the
previously existing pod annotation for fail open.  The pod annotations for 
fail open will be deprecated soon.


**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:
```release-note
Allow ImageReview backend to return annotations to be added to the created pod.
```

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Bump ip-masq-agent to v2.1.1

**What this PR does / why we need it**:
- Update debian-iptables image for CVEs.
- Change chain name to IP-MASQ to be compatible with the pre-injected masquerade rules.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #NONE

**Special notes for your reviewer**:
/assign @bowei 
cc @satyasm

**Release note**:

```release-note
Bump ip-masq-agent to v2.1.1
- Update debian-iptables image for CVEs.
- Change chain name to IP-MASQ to be compatible with the
pre-injected masquerade rules.
```

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use pause image with fat-manifest

What this PR does / why we need it:
Pause manifest code is merged in #57723, so we should use new image in test.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

Release note:

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fix updateJob scheduling of resync

fixes #66071 

```release-note
NONE
```

- Update debian-iptables image for CVEs.
- Change chain name to IP-MASQ to be compatible with the
pre-injected masquerade rules.

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Prevent side effects on dryrun in service registry

```release-note
NONE
```

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Remove unused function timeoutFromListOptions()

**What this PR does / why we need it**:
It removes a function which is not exported and not called or referenced.

Re-opening #60215 after rebase.

**Which issue(s) this PR fixes** 
No issue.

**Special notes for your reviewer**:
I guess it would be useful to know what this was supposed to be doing. I just happened upon it when trying to understand how watch timeouts were configured.

**Release note**:
```release-note
NONE
```

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Fix kubeadm init kernel validator display message error
Signed-off-by: Yuanbin.Chen <cybing4@gmail.com>



**What this PR does / why we need it**:

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes kubernetes/kubeadm#1051

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

update e2e shell script due to newly introduced unreachable:NoSchedule taint when the node is in Unknown status

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Added set and map structural validation for AllowedTopologies

**What this PR does / why we need it**: Adding structural validation to AllowedTopologies field in StorageClass.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #66184

**Release note**:

```release-note
AllowedTopologies field inside StorageClass is now validated against set and map semantics. Specifically, there cannot be duplicate TopologySelectorTerms, MatchLabelExpressions keys, and TopologySelectorLabelRequirement Values.
```

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HPA metrics specificity improvements

**What this PR does / why we need it**:
Improves available specificity for HPA metrics by adding metric selector fields for metrics of Pods and Objects. 

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Implements this KEP: https://github.com/kubernetes/community/pull/2055

**Special notes for your reviewer**:
Need to add/update tests?

**Release note**:

```release-note
Introduces autoscaling/v2beta2 and custom_metrics/v1beta2, which implement metric selectors for Object and Pods metrics, as well as allowing AverageValue targets on Objects, similar to External metrics.
```

/assign @DirectXMan12