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admission: wire through validating-only admission

Based on https://github.com/kubernetes/kubernetes/pull/54232.

This is important and required for beta because it affects the shape of the webhook admission plugins that are going to be produced and is needed to make sure that our existing chain continues to properly verify and protect the API objects based on their final state after webhook admission mutators run.

We discussed this in the October 11 API machinery call with @erictune and @caesarxuchao and we agreed to do this as a requirement for beta. See this part of the recording: https://www.youtube.com/watch?v=mrgDPHyr4VY#t=325 .

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Fix error for strategic merge patch of custom resources

Fixes #50037.

We need the go struct tags `patchMergeKey` and `patchStrategy` for fields that support a strategic merge patch. For native resources, we can easily figure out these tags since we know the fields.

Because custom resources are decoded as Unstructured and because we're missing the metadata about how to handle each field in a strategic merge patch, we can't find the go struct tags. Hence, we can't easily  do a strategic merge for custom resources.

So we should fail fast and return an error.

**Release note**:

```release-note
NONE
```

/cc @sttts @deads2k @ncdc

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rename metric reflector_xx_last_resource_version

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

mv reflector name from metric name to metric label

before:

```
reflector_k8s_io_kubernetes_pkg_client_informers_informers_generated_internalversion_factory_go:73_8664_last_resource_version{instance="104.154.20.21:443",job="kubernetes-apiservers"}
```

after

```
reflector_last_resource_version{instance="10.0.2.15:6443",job="kubernetes-apiservers",name="k8s_io_kubernetes_pkg_client_informers_informers_generated_internalversion_factory_go_73_8664"}
```

**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 #52121 

**Special notes for your reviewer**:

None

**Release note**:

```release-note
NONE
```

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Allow override of cluster level (default, whitelist) tolerations by namespace level empty (default, whitelist) tolerations.

Currently In PodTolerationRestriction admission plugin, if namespace level default and whitelist of tolerations are nil or empty, they do not override cluster level default and whitelist tolerations. 

This PR fixes the plugin to not override cluster level tolerations only when namespace level toleration are nil. IOW, if namespace level toleration are empty, they override cluster level tolerations. To be more clear, if following annotations are set to empty, they override cluster level tolerations.
 
``` 
scheduler.alpha.kubernetes.io/defaultTolerations : ""
scheduler.alpha.kubernetes.io/tolerationsWhitelist: ""
```

This behavior is inline with PodNodeSelector admission plugin too.

@sjenning @derekwaynecarr 

**Release Note**:

```release-note
In PodTolerationRestriction admisson plugin, if namespace level tolerations are empty, now they override cluster level tolerations. 
```

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NewProxierWithNoProxyCIDR: fix handling IPv6 URLs

**What this PR does / why we need it**:
Current logic of splitting hostname from URL does not work if URL
is for IPv6 address and does not explicitly specify port number.
Example: "https://[2001:db8::1]/".

Use standard library function to get hostname out of URL string.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: 
**Special notes for your reviewer**:

**Release note**:
```release-note
- Fix handling of IPv6 URLs in NO_PROXY.
```

/area ipv6
/sig api-machinery

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kubenet: yield lock while executing CNI plugin.

The CNI plugin can take up to 3 seconds to execute. CNI plugins can safely be
executed in parallel, so yield the lock to speed up pod creation.

This caused problems with the pod latency tests - previously, CNI plugins executed
in under 20ms. Now they must wait for DAD to finish and addresses to leave
tentative state.

Fixes: #54651

**What this PR does / why we need it**:
After upgrading CNI plugins to v0.6 in #51250, the pod latency tests began failing. This is because the plugins, in order to support IPv6, need to wait for DAD to finish. Because this
delay is while the kubenet lock is held, it significantly slows down the pod creation rate.

**Special notes for your reviewer**:
The CNI plugins also do locking for their critical paths, so it is safe to run them concurrently.

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

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Improve deleteOptions doc

**What this PR does / why we need it**:
This PR improves the doc of the 'PropagationPolicy' property of the DeleteOptions struct.
The said field is a string. It is very important a field for people who invoke a delete API.
For example, direct invocation of the deployment-delete API using the python client will have the replicaset and pods left behind. However, this field was not well documented. When people wanted to try different options, they have to dig into k8s source code to find out the acceptable values.

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

**Special notes for your reviewer**:

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

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Useful helper functions for Unstructured

**Which issue this PR fixes**:
Fixes #40790

**Release note**:
```release-note
NONE
```
/kind feature
/sig api-machinery
/area client-libraries
/assign @sttts @liggitt

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Migrate netwrok partition test to sig apps

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

Migrate network partition relevant e2e test to sig-app. 

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
Ref Umbrella issue #49161

**Special notes for your reviewer**:

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

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Update the get command to follow more conventions of commands

Pure code movement, builds on top of #54446 and only the last commit is new. Will make refactoring get easier.

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Fix a bug checking DaemonSet pods are updated in e2e test

**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 #50586

**Special notes for your reviewer**: @kubernetes/sig-apps-bugs 

**Release note**:

```release-note
NONE
```

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Inventory of kubectl dependency on main repository

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

Add an import-boss file to inventory what kubectl depends on, so
we can prune this list over time and eventually get kubectl out
of the main k/k repository.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Related to https://github.com/kubernetes/kubectl/issues/114

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

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refactor ReplicaSet sync call tree

**What this PR does / why we need it**:
This PR refactors ReplicaSet sync call tree by refactoring `manageReplicas` and `syncReplicaSet` functions into smaller functions, and adding unit tests to each of the smaller functions.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: xref #52118

**Release note**:

```release-note
NONE
```
**TODO**:
- `manageReplicas`
  - [x] move both outer and inner `batchSize` loops to a helper function named `slowStartBatch`, and test the function
  - [x] add a helper function returning a list named `podsToDelete`, test the function, and refactor `DeletePod` loop to use the list
  - [x] refactor skipped pod handling such that it happens after `slowStartBatch` returns

- `syncReplicaSet`
  - [x] add unit tests for `calculateStatus`
  - [x] move `canAdoptFunc` to a helper function

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Add sig-storage prefix for common e2e tests

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

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
ref: #49161
**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

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Make github hide generated files in diffs

**What this PR does / why we need it**:
https://github.com/github/linguist#generated-code says to add `linguist-generated=true` to any files that you don't want to see diffs in. IMO this will make PRs a little easier to review.

e.g. the top half of https://github.com/kubernetes/kubernetes/pull/53988 should disappear

**Which issue this PR fixes** 

**Special notes for your reviewer**:

**Release note**: NONE

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extra_sans option added to load balancer

Also cleaned up kubernetes-master charm to use the new method of determining a certificate has changed.


**What this PR does / why we need it**:
Adds an option for the load balancer charm to add extra SAN entries to the generated certificate used by nginx.
**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
Added extra_sans config option to kubeapi-load-balancer charm. This allows the user to specify extra SAN entries on the certificate generated for the load balancer.
```

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Add bsalamat to milestone maintainers

**Release note**:

```release-note
NONE
```

@thockin @davidopp

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Do not clobber KUBERNETES_PROVIDER - fix kubeadm/gce log collection

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

This gets in the way of correct log collection for at least
the kubeadm/gce jobs. Not sure if this piece of code is needed
any more.

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

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

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Optimize the suboptimal image locality algorithm

**What this PR does / why we need it**: Cut loop depth from 3 to 2. 

**Release note**:
```release-note
None
```

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set leveled logging (v=4) for 'updating container' message

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

Currently cpu_manager.go logs a line for every pod at every reconcilePeriod (10 sec default) when it reconciles and updates the pod's cpuset setting.   This creates a lot of logging information that is not very interesting and we should suppress that by default by increasing the logging level.

**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 #54804

**Special notes for your reviewer**:

I chose V(4) because that seems to be a popular level for messages at this detail.   Happy to follow logging guideline if there is any.

**Release note**:

``` kubelet: cpu_manager logs informative reconcile message at V(4) to reduce clutter ```

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fix kubelet startup args

**What this PR does / why we need it**:
There should not be space between memory and disk.

**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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trigger endpoint update on pod deletion

Fixes #54723

cc: @joelsmith 

```release-note
Fix a bug where pod address is not removed from endpoints object while pod is in graceful termination.
```

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fix a syntax error in a comment

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

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

**Special notes for your reviewer**:

**Release note**:

```release-note
```

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DaemonSet e2e should wait for history creation

**What this PR does / why we need it**:
Found a potential test flake while debugging #54575. ControllerRevisions are created separately with DaemonSet pods by controller, so we should wait for its creation in e2e. 

**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**: @kubernetes/sig-apps-bugs 

**Release note**:

```release-note
NONE
```

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Update volume OWNERS to reflect active sig-storage reviewers

**What this PR does / why we need it**:
Update sig-storage reviewers to add new members and remove those that don't have as much time to review storage PRs.   Approvers are unchanged.

**Special notes for your reviewer**:
For all those that have been removed, please approve.  If you want to remain as a reviewer, let me know and I will add you back.

**Release note**:
NONE

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Move hardcoded constants to the beginning of configure.sh script.

**What this PR does / why we need it**:
Move hardcoded constants of component version and sha1 to the beginning of configure.sh to make it easier for GKE image preloader to parse.

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

**Special notes for your reviewer**:

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

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ClusterAutoscaler 1.0.2-beta2