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Hpa ext client

```release-note
Removed support for HPA in extensions client.
```

fix #21578

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Add GetDeviceNameFromMount in mount_unsupported.go

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Fix verbosity flag in cluster autoscaler manifest

cc: @piosz

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pkg/storage: remove Codec() from interface

What?
Removes Codec() from storage.Interface.

Why?
- storage interface doesn't need to expose Codec().
- Codec() isn't used anywhere.

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Add validation conditions for autoscale

When validate the value of max and min in autoscale.go, it should append all the invalid conditions to errs, and print the value.

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Modify IsInvalidObj name and description

IsInvalidObj  note incorrect, modify it.

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Add note: kubelet manages only k8s containers.

Kubelet wrote log when accesing container which was not created in k8s, what could confuse users. That's why we added note about it in documentation and lowered log level of the message to 5.

Here is example of the message: 
```
> Apr 19 11:50:32 openshift-114.lab.sjc.redhat.com atomic-openshift-node[9551]: 
I0419 11:50:32.194020    9600 docker.go:363] 
Docker Container: /tiny_babbage is not managed by kubelet.
```

bug 1328441
Bugzilla link https://bugzilla.redhat.com/show_bug.cgi?id=1328441

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add shortname for certificate signing request in kubectl

#30163

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Correct the url in comment and optimise the code style

The PR modified two aspects:
1) Correct the url in comment, the original url can't be accessed;
2) Optimise the code style according to the go style guide.

Revert part of #30424

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Adding top-level OWNERS file.

Fixes #29575

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remove duplicate word in CHANGELOG

<!--
Checklist for submitting a Pull Request

Please remove this comment block before submitting.

1. Please read our [contributor guidelines](https://github.com/kubernetes/kubernetes/blob/master/CONTRIBUTING.md).
2. See our [developer guide](https://github.com/kubernetes/kubernetes/blob/master/docs/devel/development.md).
3. If you want this PR to automatically close an issue when it is merged,
   add `fixes #<issue number>` or `fixes #<issue number>, fixes #<issue number>`
   to close multiple issues (see: https://github.com/blog/1506-closing-issues-via-pull-requests).
4. Follow the instructions for [labeling and writing a release note for this PR](https://github.com/kubernetes/kubernetes/blob/master/docs/devel/pull-requests.md#release-notes) in the block below.
-->

```release-note
remove duplicate word in CHANGELOG
```
Signed-off-by: Xianglin Gao <xlgao@zju.edu.cn>

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Node Conformance Test: Start e2e services in a separate process

For https://github.com/kubernetes/kubernetes/issues/30122.

This is the first step of https://github.com/kubernetes/kubernetes/issues/30174.

This PR added a `start-services-only` mode in the test suite, and start all e2e services in a separate process by run the test binary again in `start-services-only` mode.

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Update dnsprovider multi-type support test to test for an A-record and an AAAA-record.

Having an A-record and a CNAME-record in the tests led to a confusion
that dns providers support such configurations. This change avoids
that confusion by putting only compatible records for the same domain
name in the tests.

cc @kubernetes/sig-cluster-federation

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Support percentage threshold for eviction 

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Implement DisruptionController.

Part of #12611

This currently also includes a pending commit from #25895

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Node E2E: Stop throwing fatal error in buildGo to fix vm leak.

Fixes https://github.com/kubernetes/kubernetes/issues/30719.

Avoid throwing out fatal error during `buildGo`.  As is pointed out in https://github.com/kubernetes/kubernetes/issues/30719#issuecomment-240283268, we delete vm instances in `defer`. However, `defer` will not be called if there is a fatal error (process exits immediately) 
http://stackoverflow.com/questions/17888610/are-deferred-functions-called-when-calling-log-fatalln.

This PR:
* changes all fatal error during create/delete instance to normal error so as to make sure we have a chance to delete the instance.
* adds log for instance deletion so as to better surface similar error in the future.

@dchen1107 @yujuhong 
/cc @kubernetes/sig-node

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Fixing the error in registering /v1 api

Temporary fix for https://github.com/kubernetes/kubernetes/issues/30635.

Am working on a proper fix, but its much bigger.
Would be good to unblock devs in the meantime.

cc @lavalamp @kubernetes/sig-api-machinery

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Create a kubekins-e2e image with runner and dependencies

Update dockerized-e2e-runner.sh to just run an image with the appropriate e2e environment variables set.

e2e-runner.sh, upload-to-gcs.sh and e2e.go now live inside the container.

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re-organize development.md 

Addresses issue #13876; reorganizes and cleans up parts of development.md; splits out the godep section for managing `vendor/` tree dependencies into a new godep.md file.

```release-note
The developer guide has been reorganized to facilitate the majority of new developers working on Kubernetes.
```
Signed-off-by: Mike Brown <brownwm@us.ibm.com>

Revert "syncNetworkUtil in kubelet and fix loadbalancerSourceRange on GCE"

Add GetDeviceNameFromMount in mount_unsupported.go

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syncNetworkUtil in kubelet and fix loadbalancerSourceRange on GCE

fixes: #29997 #29039

@yujuhong Can you take a look at the kubelet part?

@girishkalele KUBE-MARK-DROP is the chain for dropping connections. Marked connection will be drop  in INPUT/OUTPUT chain of filter table. Let me know if this is good enough for your use case.

Part of #12611

Having an A-record and a CNAME-record in the tests led to a confusion
that dns providers support such configurations. This change avoids
that confusion by putting only compatible records for the same domain
name in the tests.

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Add NodeName to EndpointAddress object

Adding a new string type `nodeName` to api.EndpointAddress.
We could also do  *ObjectReference to the api.Node object instead, which would be more precise for the future.

```
type ObjectReference struct {
    Kind            string    `json:"kind,omitempty"`
    Namespace       string    `json:"namespace,omitempty"`
    Name            string    `json:"name,omitempty"`
    UID             types.UID `json:"uid,omitempty"`
    APIVersion      string    `json:"apiVersion,omitempty"`
    ResourceVersion string    `json:"resourceVersion,omitempty"`

    // Optional. If referring to a piece of an object instead of an entire object, this string
    // should contain information to identify the sub-object. For example, if the object
    // reference is to a container within a pod, this would take on a value like:
    // "spec.containers{name}" (where "name" refers to the name of the container that triggered
    // the event) or if no container name is specified "spec.containers[2]" (container with
    // index 2 in this pod). This syntax is chosen only to have some well-defined way of
    // referencing a part of an object.
    // TODO: this design is not final and this field is subject to change in the future.
    FieldPath string `json:"fieldPath,omitempty"`
}
```

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Check resource leaks only when needed

@fejta 

Broken by #28575

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Fix resource leak check in case of run that cleans up after failed one

@fejta

Broken by #28575

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Add back the original liveness check timeout.

Fixes https://github.com/kubernetes/kubernetes/issues/30342.
Fixes https://github.com/kubernetes/kubernetes/issues/30335.

When I moved the test into common directory, I removed the original 10s timeout - https://github.com/kubernetes/kubernetes/pull/29814/commits/0362789283d06c31b42e94ac7e81c1ba981a0b87#diff-0f856ff011970dca55a2cd916b9ddcf0L1128.

It turns out that the default 1s timeout is not enough. In all the flake, the probe request is cancelled on the kubelet side. This PR added back a 5s timeout to eliminate the flake.

Mark P0 to match the corresponding issue.

@freehan 
/cc @matchstick :)

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Bump cluster autoscaler to 0.3.0-beta1

cc: @piosz @fgrzadkowski @jszczepkowski

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pkg/storage: cleanup unused Config

The entry has been moved to [pkg/storage/storagebackend/factory.Create()](https://github.com/kubernetes/kubernetes/blob/master/pkg/storage/storagebackend/factory/factory.go#L27)

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cluster/gke: reword package docs

Rewords the package docs and removes the confusing dot trailing the file name

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SetClientFactory in FederatedInformer

For unit tests.

cc: @quinton-hoole @wojtek-t @kubernetes/sig-cluster-federation