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Check kubeClient nil in Kubelet and bugfix

1. check kubeClient nil first before using as it maybe nil
2. configMaps and secrets map do not be used properly and should use it as cache

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Change the default volume type of GlusterFS provisioner.

At  present provisioner creates 'Distribute' Volume and  this patch change the default
volume type 'Distribute Replica:(3)' volume.

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Adding a README for federation API ref docs

The API ref docs were added in https://github.com/kubernetes/kubernetes/pull/31759

README makes it easy to link to all other API-ref docs.

This is similar to the existing docs/api-reference/README.md for kubernetes.

cc @kubernetes/sig-cluster-federation @caesarxuchao

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move informer and controller to pkg/client/cache

@kubernetes/sig-api-machinery

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Centralize install code

Trying to figure out a way to do this that makes the changes as painless to roll out as possible. This is going to be a multi-step process...

[kubelet] Fix oom-score-adj policy in kubelet

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use discovery restmapper for kubectl

Updates the `kubectl` factory to use a discovery rest mapper for locating resources.  This allows generic gets.

@kargakis @sttts @fabianofranz I'll let you guys fight over it. :)

Revert "Add test for --quiet flag for kubectl run"

Signed-off-by: Mike Danese <mikedanese@google.com>

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Fix node upgrade in e2e tests

This is fixing automatic ugprade tests in GCE

@davidopp @pwittrock

This reverts commit 9e52d1cf.

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docs: devel: tell people how to find flake tests

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Clarify the "version" requirement in CRI and fix various bugs in dockershim

This fixes #32741

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Fix typo in scheduler doc

Also add parentheses

This doc talks about flake tests but never links to all of them. Fix
this so people can dive in.

At present, provisioner creates Distribute Volume and this patch
change the default volume type to Distribute-Replica(3) volume.
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>

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Fix logging in cacher

@smarterclayton @liggitt @hongchaodeng

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restrict discoverable versions to those that have resources

Prevents versions with no resources from appearing in discovery.

@soltysh ptal.  I think you have some issues for this, mind wiring them up?

```
kubectl api-versions
apps/v1alpha1
authentication.k8s.io/v1beta1
authorization.k8s.io/v1beta1
autoscaling/v1
batch/v1
certificates.k8s.io/v1alpha1
extensions/v1beta1
policy/v1alpha1
rbac.authorization.k8s.io/v1alpha1
storage.k8s.io/v1beta1
v1
```
Fixes  #29998.

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Exit scheduler retry loop correctly

The error was being eaten and shadowed, which means we would never exit
this loop. This might lead to a goroutine in the scheduler being used
forever without exiting at maximum backoff.

Switched to use the real client to make later refactors easier.

@wojtek-t this may lead to scheduler informer exhaustion - not that familiar with retries

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Revert "Use PV shared informer in PV controller"

Fixes #32497 

Reverts kubernetes/kubernetes#30825

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Revert "Revert "Allow webhook authenticator to use TokenReviewsInterface""

Reverts https://github.com/kubernetes/kubernetes/pull/32591 (commit 0a02c827)
Readds https://github.com/kubernetes/kubernetes/pull/32547

Holding until GKE webhook authenticator is updated by @cjcullen

Reduce maximum number of net-proxy pods to make test work in large cl…

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Kubelet: add garbage collection for new runtime API

This PR adds garbage collection for new runtime API.

Note that this PR also adds `CreatedAt` and `PodSandboxId` to `ListContainers()` result.

CC @yujuhong @Random-Liu  @kubernetes/sig-node @kubernetes/sig-rktnetes

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Added --log-facility flag to enhance dnsmasq logging

Fix #31010.

Dnsmasq in kube-dns pod is logging in default setting, which is somehow hard to locate. Add --log-facility=- flag to redirect logs to std.

@girishkalele

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Unstructured methods belong in unstructured.go

Simple code move

@krousey just movement

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Set Dashboard UI to final 1.4 version

Release info: https://github.com/kubernetes/dashboard/releases/tag/v1.4.0

Diff since beta2: a few bug fixes.

This is final release for this quarter.

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Set --alsologtostderr=true in integration test

Without the flag, no glog output are stored in the test results. The logs are useful for debugging flaky tests like https://github.com/kubernetes/kubernetes/issues/30228.

The change also reveals a lot of messages like `W0912 14:19:32.306719   25386 cacher.go:468] Terminating all watchers from cacher *api.LimitRange`, which doesn't seem right.

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Fix audit_test regex for iso8601 timestamps

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**What this PR does / why we need it**:  The audit_test unit test fails as some iso8601 timestamps are of the form 2016-09-13T10:32:50.823081217Z and the current regex doesn't allow T's or Z's.

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

**Special notes for your reviewer**:

**Release note**:NONE
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```release-note
```
Signed-off-by: Johnny Bieren <jbieren@redhat.com>

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Add glusterfs-client in hyperkube image.

When we run kubernete in a docker container, the glusterfs volume doesn't work.
This PR add glusterfs-client package in hyperkube image to fix the bug.

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fix hack/verify-golint.sh on a Mac

Relax the location of the files a bit (Don't assume the
k8s.io/kubernetes always!)

Fixes #31905

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EnableGarbageCollection should be part of generic.RESTOptions

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Do not report warning event when an unknown deleter is requested

When Kubernetes does not have a plugin to delete a PV it should wait for
either external deleter or storage admin to delete the volume instead of
throwing an error.

This is the same approach as in #32077

@kubernetes/sig-storage