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[kube-proxy] Modify log level from Info to Warning when proxyMode unknown

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

Currently, we use `glog.Infof` to print the log when proxy-mode is unknown, I think we may need to modify to `glog.Warningf`.

**Which issue this PR fixes**: 

fixes #31405

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add retries for add/update/remove taints on node in taints e2e

fixes taint update conflict in taints e2e by adding retries for add/update/remove taints on node.
ref #27655 and #31066

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bump cni to 9d5e6e6

fixes: #31348

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Don't error out if ${go_pkg_dir} already exists

I have 'make' aliased to 'make -j4' for various reasons, and that's always worked fine for Kubernetes in the past.  But it recently broke because EEXIST errors from this symlink creation are fatal.  So make them not fatal, because if the path already exists, why try to create it again?  It exists because two invocations of setup_env() are run in parallel due to the -j4, and they race to create the symlink and one obviously fails.

ln: failed to create symbolic link ‘/home/dcbw/Development/containers/kubernetes/_output/local/go/src/k8s.io/kubernetes’: File exists
Makefile.generated_files:285: recipe for target '_output/bin/deepcopy-gen' failed
make[1]: *** [_output/bin/deepcopy-gen] Error 1
make[1]: *** Waiting for unfinished jobs....
+++ [0826 10:18:02] Generating bindata:
    /home/dcbw/Development/containers/kubernetes/test/e2e/framework/gobindata_util.go
+++ [0826 10:18:02] Building the toolchain targets:
    k8s.io/kubernetes/hack/cmd/teststale
+++ [0826 10:18:03] Building go targets for linux/amd64:
    cmd/libs/go2idl/conversion-gen
Makefile:281: recipe for target 'generated_files' failed
make: *** [generated_files] Error 2

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Get network name via e2e environment.

This should work, right? I plan to pipe it through into the TestContext soon, just not today, and I'd like some test runtime over the weekend. Open to suggestions.

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[AppArmor] Promote AppArmor annotations to beta

Justification for promoting AppArmor to beta:

1. We will provide an upgrade path to GA
2. We don't anticipate any major changes to the design, and will continue to invest in this feature
3. We will thoroughly test it. If any serious issues are uncovered we can reevaluate, and we're committed to fixing them.
4. We plan to provide beta-level support for the feature anyway (responding quickly to issues).

Note that this does not include the yet-to-be-merged status annotation (https://github.com/kubernetes/kubernetes/pull/31382). I'd like to propose keeping that one alpha for now because I'm not sure the PodStatus is the right long-term home for it (I think a separate monitoring channel, e.g. cAdvisor, would be a better solution).

/cc @thockin @matchstick @erictune

Revert "Remove deprecated Namespace admission plug-ins"

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add Makefile for building/pushing cni binary

fixes: #27211

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Set imagefs rank and reclaim functions when nodefs+imagefs share comm…

Fixes #31192 

I decided that the behavior should match the current output of the kubelet summary API.  With no dedicated imagefs, the ranking and reclaim functions will match the nodefs ranking and reclaim functions.

/cc @ronnielai @vishh

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Remove deprecated Namespace admission plug-ins

```release-note
The NamespaceExists and NamespaceAutoProvision admission controllers have been removed.

All cluster operators should use NamespaceLifecycle.
```

Fixes https://github.com/kubernetes/kubernetes/issues/31195

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In SJ e2e test, check only running jobs

We should filter "running" jobs in SJ e2e test


**Release note**:
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cc @erictune @soltysh

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Fix missing expansion files in clientset release 1.4

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**What this PR does / why we need it**:
Fix missing expansion files in clientset release 1.4;
Update the client-gen tool to automatically update generated_expansion.go;
Update the readme to document the best practice of using client-gen.

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

https://github.com/kubernetes/kubernetes/issues/29698#issuecomment-241315798


**Special notes for your reviewer**:

**Release note**:
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```release-note
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cc @lavalamp @krousey @mbohlool

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fix deleteVolume

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refactor destroy func in unit testing

Continued on https://github.com/kubernetes/kubernetes/pull/31390#issuecomment-242572312

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fix feature_gates salt plumbing

Fix salt plumbing for `--feature-gate` from `FEATURE_GATES kube env.

Was generating grains.conf and kube-env for master only. Verified it works now for gci and debian master/nodes.

cc @thockin @timstclair

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[GarbageCollector] make the gc e2e test more strict

See if there is any bug orphaning RC with large replicas.

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Add AppArmor feature gate

Add option to disable AppArmor via a feature gate. This PR treats AppArmor as Beta, and thus depends on https://github.com/kubernetes/kubernetes/pull/31471 (I will remove `do-not-merge` once that merges).

Note that disabling AppArmor means that pods with AppArmor annotations will be rejected in validation. It does not mean that the components act as though AppArmor was never implemented. This is by design, because we want to make it difficult to accidentally run a Pod with an AppArmor annotation without AppArmor protection.

/cc @dchen1107

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Fix the bug that SJ sees finished jobs as unexpected

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

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #31472 

**Special notes for your reviewer**:

**Release note**:
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cc @soltysh @erictune

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Print out resource name when evicting pods

This fixes #31397


/cc @derekwaynecarr

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[GarbageCollector] Increase log verbosity for Garbage collector tests

I cannot reproduce the flake of GC locally, see https://github.com/kubernetes/kubernetes/issues/28713#issuecomment-237842105, so I increased the log verbosity for Garbage collector tests.

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Add validation preventing recycle of / in a hostPath PV

Adds a validation that prevents a user from recycling `/` when it is used in a hostPath PV

cc @kubernetes/sig-storage

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add validation for PV spec to ensure correct values are used for ReclaimPolicy on initial create

k8 currently allows invalid values for ReclaimPolicy (i.e. "scotto") - this allows the PV to be created and even bound, however, when the pvc or pod is deleted and the recycler is triggered, an error is thrown

```
Events:
  FirstSeen	LastSeen	Count	From				SubobjectPath	Type		Reason				Message
  ---------	--------	-----	----				-------------	--------	------				-------
  36s		36s		1	{persistentvolume-controller }			Warning		VolumeUnknownReclaimPolicy	Volume has unrecognized PersistentVolumeReclaimPolicy
```

New behavior will not allow the user to create the PV:

```
[root@k8dev nfs]# kubectl create -f nfs-pv-bad.yaml 
The PersistentVolume "pv-gce" is invalid: spec.persistentVolumeReclaimPolicy: Unsupported value: "scotto": supported values: Delete, Recycle, Retain
```

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[Federation] Downsize the release binary distribution v2.

Second attempt of PR #29632.

There are two things that this PR does:

1. It removes `federation-apiserver` and `federation-controller-manager` from binaries and docker_wrapped_binaries target lists.
2. Build the docker image for `hyperkube` on-the-fly while pushing the federation images. 

```release-note
Federation binaries and their corresponding docker images - `federation-apiserver` and `federation-controller-manager` are now folded in to the `hyperkube` binary. If you were using one of these binaries or docker images, please switch to using the `hyperkube` version. Please refer to the federation manifests - `federation/manifests/federation-apiserver.yaml` and `federation/manifests/federation-controller-manager-deployment.yaml` for examples.
```

cc @kubernetes/sig-cluster-federation @colhom 

Fixes Issue #28633

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Remove duplicate entry from CHANGELOG.md.

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Use upgraded container-vm by default on worker nodes for GCE k8s clusters

For https://github.com/kubernetes/kubernetes/issues/25276
Depends on https://github.com/kubernetes/test-infra/pull/417

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Delete the broken Celery+RabbitMQ example

The celery container used in the example is broken and does not come up
on most distros. The e2e test that was validating this example was not
detecting the fact the celery pod was crash looping. 
I attempted to fix the celery container, but it proved to be tedious.
The proposed fix is to update the glibc version to >= 2.23. In this case
it requires updating the python docker image and the celery base image.

https://github.com/kubernetes/kubernetes/issues/31456
has more details. 

I'm deleting the example instead of marking it as broken because a user
might overlook the broken warning and it should be trivial to revert
this PR if someone can fix the celery container.

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Wait for the memory pressure condition to be absent before finishing memory eviction test

Let's see if this helps with the Serial tests. It should at least get us some more information that will help figure out why they are failing.

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Add get/delete cluster, delete context to kubectl config

Fixes #29794 by adding `get-clusters`, `delete-cluster` and `delete-context` actions to `kubectl config`.

If it already exists, the world is OK and there's no need to panic.