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integration: refactor, cleanup, and add more tests for TokenRequest

ref #58790

```release-note
NONE
```

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Expose default service IP CIDR in apiserver

**What this PR does / why we need it**:
The `--service-cluster-ip-range` parameter of API server is very important for deploying Kubernetes on some clouds. The default CIDR "10.0.0.0/24" should be exposed at least from the API server's help message so that users have a better idea whether they need to change it.
This patch exposes this default value in API server's help message.

**Which issue this PR fixes** : fixes #51248

**Release note**:
```
NONE
```

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Allow TTLs to be plumbed through to webhook authn/authz in gce scripts.

Just allows these flags to be configured from the startup scripts.

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[garbage collector] fix log info

typo


**Release note**:

```release-note
NONE
```

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Indicate endpoint subsets are an optional field

Fixes #59403 

```release-note
NONE
```

Merge pull request #59882 from kris-nova/kubeadm-demote-controlplane-passthrough-flags-to-phases-alpha

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kubeadm: Demote controlplane passthrough flags to phases alpha

After a discussion in sig cluster lifecycle we agreed that the passthrough flags should live in phases alpha, and not be 1st class flags. They already exist in the alpha command, so just removing from here.



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

We introduced some flags as 1st class flags in #58080 and decided as a sig that the flags should only live in the `alpha` command. This PR removes the flags from the `init` command so they only exist in the `alpha` command

**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 #

relates to kubernetes/kubernetes/pull/58080
fixes kubernetes/kubeadm/issues/676

**Special notes for your reviewer**:

This is a cosmetic change, and doesn't alter any functionality of the program, only the avenue in which a user access functionality in the program.

**Release note**:

```release-note
kubeadm: Demote controlplane passthrough flags to alpha flags
```

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DevicePlugins feature is beta in 1.10 release

**What this PR does / why we need it**:
Graduates DevicePlugins feature to beta.

**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 https://github.com/kubernetes/kubernetes/issues/56649

**Special notes for your reviewer**:

**Release note**:

```release-note
DevicePlugins feature graduates to beta.
```

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Only run connection-rejecting rules on new connections

Kube-proxy has two iptables chains full of rules to reject incoming connections to services that don't have any endpoints. Currently these rules get tested against all incoming packets, but that's unnecessary; if a connection to a given service has already been established, then we can't have been rejecting connections to that service. By only checking the first packet in each new connection, we can get rid of a lot of unnecessary checks on incoming traffic.

Fixes #56842

**Release note**:
```release-note
Additional changes to iptables kube-proxy backend to improve performance on clusters with very large numbers of services.
```

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e2e tests for multizone PDs

**What this PR does / why we need it**: e2e tests for multizone PDs.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
partially fixing #59988

/release-note-none

/assign @msau42 @saad-ali

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Adding credentials support for k8s core CSI  

PR implements changes proposed in: https://github.com/kubernetes/community/pull/1816

```release-note
CSI now allows credentials to be specified on CreateVolume/DeleteVolume, ControllerPublishVolume/ControllerUnpublishVolume, and NodePublishVolume/NodeUnpublishVolume operations
```

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Update test framework featuregates type

**What this PR does / why we need it**:
A cleanup following #53025 and #57962.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
ref: #53025
and #57962.

**Special notes for your reviewer**:
but yeah, not sure if it's worthy to do this :)

**Release note**:

```release-note
NONE
```

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Disable mount propagation for windows containers

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

Windows containers don't support mount propagation. This PR disables it for windows containers.

Without this PR, windows containers creation would fail with error:

 Error: Error response from daemon: invalid bind mount spec "c:\\var\\lib\\kubelet\\pods\\a260a7c4-1852-11e8-bb1d-000d3a19c1da\\volumes\\kubernetes.io~secret\\default-token-rj7qv:c:/var/run/secrets/kubernetes.io/serviceaccount:ro,rslave": invalid volume specification: 'c:\var\lib\kubelet\pods\a260a7c4-1852-11e8-bb1d-000d3a19c1da\volumes\kubernetes.io~secret\default-token-rj7qv:c:\var\run\secrets\kubernetes.io\serviceaccount:ro,rslave'


**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 #60274

**Special notes for your reviewer**:

**Release note**:

```release-note
Disable mount propagation for windows containers.
```

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Pass location parameter to event exporter.

**What this PR does / why we need it**:
This PR makes event-exporter export cluster location together with events.

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

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

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Namespace should support table printing

@soltysh 

Part of #58536

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Improves backoff policy in JobController

**What this PR does / why we need it**:
This PR is fixing the issue: #56853, It improves the "Job backoff policy" when Job is configure to allow parallelism and few pods' Jobs failed but others succeed. 
Now, it checks if the number of pods succeeded increased since the last check. If yes the backoff delay is cleared. 

**Which issue(s) this PR fixes**:
Fixes #56853

**Special notes for your reviewer**:

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

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Fixes for HTTP/2 max streams per connection setting

**What this PR does / why we need it**:
This PR makes two changes.  One is to introduce a parameter
for the HTTP/2 setting that an api-server sends to its clients
telling them how many streams they may have concurrently open in
an HTTP/2 connection.  If left at its default value of zero,
this means to use the default in golang's HTTP/2 code (which
is currently 250; see https://github.com/golang/net/blob/master/http2/server.go).

The other change is to make the recommended options for an aggregated
api-server set this limit to 1000.  The limit of 250 is annoyingly low
for the use case of many controllers watching objects of Kinds served
by an aggregated api-server reached through the main api-server (in
its mode as a proxy for the aggregated api-server, in which it uses a
single HTTP/2 connection for all calls proxied to that aggregated
api-server).

**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 #60042

**Special notes for your reviewer**:

**Release note**:

```release-note
Introduced `--http2-max-streams-per-connection` command line flag on api-servers and set default to 1000 for aggregated API servers.
```

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Add description of MountOptions to StorageClass describe printer

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

Print `StorageClass.MountOptions` for `kubectl describe` command.

**Release note**:

```release-note
NONE
```

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initialize all known client auth plugins

**What this PR does / why we need it**:
`k8s.io/client-go/plugin/pkg/client/auth/plugins.go` has already initialized all known client auth plugins.

https://github.com/kubernetes/kubernetes/blob/ec77ddfe19166deebc4822c78407894dd58acae1/staging/src/k8s.io/client-go/plugin/pkg/client/auth/plugins.go#L19-L25

We just need import `k8s.io/client-go/plugin/pkg/client/auth` instead.

**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 a metric exposing number of objects per type

Fix #51953

Adds a goroutine that periodically checks the count of objects in etcd and publishes a metric with this data.

```release-note
APIserver backed by etcdv3 exports metric showing number of resources per kind
```

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apiserver: fix testing etcd config in preparation for etcd 3.2.16+

The AuthToken must be set, also in non-https mode. Otherwise, etcd refuses to start.

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[kube-proxy]enhance kubeproxy init flag

**What this PR does / why we need it**:
 remove `TODO: once we switch everything over to Cobra commands, we can go back to calling
	utilflag.InitFlags() (by removing its pflag.Parse() call). For now, we have to set the
	 normalize func and add the go flag set by hand.`

**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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Updating GCE PD StorageClass parameters

**What this PR does / why we need it**: New parameter to improve support of multi-zone PDs.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*: partially addresses #59988

/cc @msau42 @saad-ali

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audit/request.go remove inaccurate TODO and fix typo

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

 remove one inaccurate `TODO` and fix a typo

**Release note**:

```release-note
NONE
```

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DaemonSet Controller and tests to apps/v1

**What this PR does / why we need it**:
Updates the DaemonSet controller, its integration tests, and its e2e tests to use the apps/v1 API.

**Release note**:
```release-note
The DaemonSet controller, its integration tests, and its e2e tests, have been updated to use the apps/v1 API.
```

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Fix image file system stats for windows nodes

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

Kubelet is reporting `invalid capacity 0 on image filesystem` on windows nodes and image GC always fails.

**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 #59742

**Special notes for your reviewer**:

**Release note**:

```release-note
Fix image file system stats for windows nodes
```

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Delete stale UDP conntrack entries that use hostPort

**What this PR does / why we need it**:
This PR introduces a change to delete stale conntrack entries for UDP connections, specifically for udp connections that use hostPort. When the pod listening on that udp port get updated/restarted(and gets a new ip address), these entries need to be flushed so that ongoing udp connections can recover once the pod is back and the new iptables rules have been installed. 
**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 #59033

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

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cmd/controller-manager: add OWNERS for generic controller-manager code

This should have the same owners as kube-controller-manager.

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Allow to specify categories for custom resources

Allow to specify categories for custom resources so that we can get it working with `kubectl get all`. 

Adds a new field `Categories` in the CRD spec.

**Release note**:

```release-note
Custom resources can be listed with a set of grouped resources (category) by specifying the categories in the CustomResourceDefinition spec. Example: They can be used with `kubectl get all`, where `all` is a category.
```

/cc sttts liggitt deads2k

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[fluentd-gcp addon] Update event-exporter

Update to new version of event-exporter which includes bugfix for metrics
https://github.com/GoogleCloudPlatform/k8s-stackdriver/releases/tag/event-exporter-v0.1.8

```release-note
[fluentd-gcp addon] Fixed bug with reporting metrics in event-exporter
```

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Remove pkg/client/unversioned

**What this PR does / why we need it**:
This is removing unused package, and moves the used bits into appropriate placeholders. 

**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 #25442

**Special notes for your reviewer**:

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

/assign @deads2k 
/assign @sttts

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Removing Flexvolume feature tag in e2e tests because Flexvolume is now GA

**What this PR does / why we need it**: Flexvolume e2e tests should be run in serial test suite after the feature was marked GA.

**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 #57466

/release-note-none
/sig storage
/cc @wongma7

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Revert "Allow env to be updated via specific key in resource"

This introduced an unstable test that is failing in our queue.

/assign @soltysh 

I'm trying to find a real fix, but let's get the revert tested and ready.

```release-note
NONE
```

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Critical pod priorityClass addition

**What this PR does / why we need it**:
@bsalamat - Apologies for the delay. This PR is to ensure that all pods with priorityClassName `system-node-critical` and `system-cluster-critical` will be critical pods while preserving backwards compatibility.

**Special notes for your reviewer**:

- Moved some constants and other data structures to scheduler/api/types.go where other constants are present.
- An automatic assignment of critical priorities to pods based on critical pod annotation for backwards compatibility including some unit tests. 
xref:  https://github.com/kubernetes/kubernetes/issues/57471 

**Release note**:

```release-note
Critical pods to use priorityClasses.
```

This reverts commit 905a0698.