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Increase buffer size in etcd_watcher

Should help with #30873

@xiang90 @hongchaodeng @kubernetes/sig-scalability

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make taints unique by <key, effect> on a node

closes #29362

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OpenAPI / Swagger2 spec generation

This is alpha version of OpenAPI spec generation. Generated "/swagger.json" file (accessible on api server) is a valid OpenAPI spec with some warnings that will be fixed in next versions of spec generation. Currently it is possible to generate a client using this spec though I did not test the clients.

reference: #13414

**Release note**:

```release-note
Alpha support for OpenAPI (aka. Swagger 2.0) specification serves on /swagger.json 
```

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Add cluster health metrics to NodeController

Follow up of #28832

This adds metrics to monitor cluster/zone status.

cc @alex-mohr @fabioy @wojtek-t @Q-Lee

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Salt configuration for Rescheduler

ref #29023

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Fix memory leak in gc

ref #30759

GC had a memory leak. The work queue item is never deleted.

I'm still fighting with my kubemark cluster to get statistics after this fix.

@wojtek-t @lavalamp

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Support for etcd migration

@xiang90 @timothysc @hongchaodeng

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ClusterAutoscaler-friendly scheduler priority function that promotes well-used nodes

It will help cluster autoscaler to put pods on nodes that are unlikely to be deleted soon due to low usage. Otherwise a pod may be frequently kicked from one node to another. A flag that enables it when CA is on will be added in a separate PR.

Fixes: #28842

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Disable linux/ppc64le compilation by default

Work-around for #30384.

I'm still testing this locally to see if it actually works. The build is slow. (PR Jenkins won't tell us whether this fixes ppc.)

cc @Random-Liu @spxtr @david-mcmahon @luxas

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extract common function in ingress and federation e2e to uil

Separate refactoring existing e2e code part from #29773
1. extract common constants, structs and functions in federated-service.go to federation-util.go, move existing util functions from federated-service.go to federation-util.go
2. extract common constants, structs and functions in ingress.go to ingress-util.go, move existing util functions from ingress.go to ingress-util.go

@quinton-hoole

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Node E2E: Make readiness check handling process exits with 0 exit code.

As is mentioned by @mtaufen:
 "there is a problem with the way service `start` is currently implemented in test/e2e_node/e2e_service.go. If the Kubelet exits with status 0 before the health check completes, cmdErrorChan will be closed and, as a result, nil will be read from that channel, and you will return a nil error from `start`."

This PR changes the logic to:
1) If the err channel returns an error, return the error
2) If the err channel returns a nil, ignore it and continue checking readiness.
3) If the err channel is closed before readiness check succeeds, replace it with `blockCh` and continue checking readiness.

@mtaufen 
/cc @kubernetes/sig-node

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Guarantee that Encode handles nested objects again

pass FederatedServiceName to createServiceOrFail and createService as they are util functions for federated service and federated ingress now.

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Move UTs that block on apiserver to integration tests. 

In validating etcd.v3client we had uncovered that a change in the behavior of the client https://github.com/coreos/etcd/issues/6162 , caused a number of unit tests to fail.  These test failures were due to the fact that the unit tests were trying to standup a apiserver even though there was no etcd backend stood up.  

This PR simply shuffles those tests to integration tests, which is where they should be. 

/cc @kubernetes/sig-scalability @wojtek-t @hongchaodeng @xiang90

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Increase concurrent GC workers, adjust the polling interval and timeout in e2e test

ref: https://github.com/kubernetes/kubernetes/issues/30759#issuecomment-240853949

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Unset a couple GINKGO_TEST_ARGS in kubekins-e2e

Address #30749

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Check return value when calling ensureDnsRecords

When [lockedUpdateDNSRecords](https://github.com/xiangpengzhao/kubernetes/blob/check_ensureDnsRecords_return_value/federation/pkg/federation-controller/service/servicecontroller.go#L723) calls `ensureDnsRecords`, it should check the return value. If it returns error, the `ensuredCount ` should not increment.

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Revert "Revert "syncNetworkUtil in kubelet and fix loadbalancerSourceRange on GCE

Reverts kubernetes/kubernetes#30729

Fix overlong junit filename prefixes

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Add GUBERNATOR flag which produces g8r link for node e2e tests

When you run 'make tests-e2e-node REMOTE=true GUBERNATOR=true' outputs a URL to view the test results on Gubernator. ~~Should work after my PR for Gubernator is merged.~~

@timstclair

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Bump up glbc version to 0.7.1

stood up should be integration tests, not unit tests.

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more explictly about NoDiskConflicts policy and applicable volume types

partially clarify #29670

@kubernetes/sig-scheduling

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Incorrect branch name for git push command in development.md

the branch name is "my-feature":

    ### Create a branch and make changes

    ```sh
    git checkout -b my-feature

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Quobyte Volume plugin

@quofelix and myself developed a volume plugin for [Quobyte](http://www.quobyte.com) which is a software-defined storage solution. This PR allows Kubernetes users to mount a Quobyte Volume inside their containers over Kubernetes.

Here are some further informations about [Quobyte and Storage for containers](http://www.quobyte.com/containers)

The nested object could be using a different scheme, or want to handle
runtime.Unknown.

Rather than one at a time.

Allows Convert() to reuse the same conversions as ConvertToVersion
without being overly coupled to the version.