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discovery: Adding a discover based RESTMapper

Added a PriorityRESTMapper that operates off of discovery information. I
made an auxiliary data type and function to help collect and organize
the information.

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azure: kube-up respects AZURE_RESOURCE_GROUP

This fixes #28482.

* declare AZKUBE_ variables as global to workaround lack of bash support for exporting array variables

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Modified influxdb petset to provision persistent  volume.


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[WIP] Modified influxdb petset to create claim.

fix hack/test-cmd

Added a PriorityRESTMapper that operates off of discovery information. I
made an auxiliary data type and function to help collect and organize
the information.

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Allow service names up to 63 characters (RFC 1035)

fixes #3752

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Retry Node updates in e2e tests

Fix #29516

Ref. https://github.com/kubernetes/kubernetes/issues/27655#issuecomment-235940057

cc @kevin-wangzefeng @wojtek-t 

Revert "[Federation] Downsize the release binary distribution."

Modified influxdb petset to provision pv.

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Change eviction logic in NodeController and make it Zone-aware

Ref. #28832

This PR changes the behavior of the NodeController. From now on 

```release-note
Change eviction policies in NodeController:
- add a "partialDisruption" mode, when more than 33% of Nodes in the zone are not Ready
- add "fullDisruption" mode, when all Nodes in the zone are not Ready

Eviction behavior depends on the mode in which NodeController is operating:
- if the new state is "partialDisruption" or "fullDisruption" we call a user defined function that returns a new QPS to use (default 1/10 of the default rate, and the default rate respectively),
- if the new state is "normal" we resume normal operation (go back to default limiter settings),
- if all zones in the cluster are in "fullDisruption" state we stop all evictions.
```

cc @wojtek-t @smarterclayton @davidopp 

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improve iptables-restore implementation #27559

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fixes #27559
- improve restoreInternal implementation in iptables
- add SetStdin and SetStdout functions to Cmd interface
- modify kubelet/prober and some tests in order to work with Cmd interface

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Fix usage of namespace shared informers in existing admission controllers

Fixes https://github.com/kubernetes/kubernetes/issues/29473

/cc @liggitt @ncdc 

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Create client from API version passed in config or use default

When creating a client read the `GroupVersion` value passed in the `restclient.Config`. If the passed `GroupVersion` does not match current group or is not enabled fallback to default `GroupVersion` for that group.

This PR should allow accessing `ScheduledJob` properly in `batch/v2alpha1`.

@smarterclayton @deads2k @caesarxuchao @lavalamp ptal

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Node E2E: Add serial jenkins job.

This PR added a jenkins job for serial test. It will run all serial test one by one.

This will be useful for https://github.com/kubernetes/kubernetes/pull/29809.

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

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Kubelet: add fake kube runtime

Add a new fake kube runtime with kubelet using the new runtime API.

CC @yujuhong @Random-Liu 

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Modified etcd manifest to support clustering.

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update node controller to use shared pod informer

continuing work from #24470 and #23575

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pods which can not be admitted should return directly

if the pod can not be admitted, the code runPod(pod, retryDelay) should not be run.

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Fix error msg in kubectl config get-contexts

Fixes #29822 

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Remove -e from 'go list' so missing files will halt the build

In the case that any of the files being processed by this pipeline are missing, `go list -e` sends the error to the template, which results in cryptic build errors like `No rule to make target '/*.go'`

This came up in #28987, and although that issue has already been fixed by munging the specific path - https://github.com/kubernetes/kubernetes/commit/2a4495cf8926b093e3f19ff5289c470002b940ec#diff-78183b4162626e1797dae5558b01caa0R423 - I suggest it would be best to take out the possibility of the same thing happening again for different reasons.

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Fix make verify

@thockin this fixes `make verify` which was previously failing due to undefined `BRANCH` and `VERBOSE` variables, ptal

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Add a flag for `kubectl expose`to set ClusterIP and allow headless services

- Use `--cluster-ip=None` to create a headless service
- Fixes #10294

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Fix markdown of flexvolume lvm example link

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Optimize pod affinity 2

Ref #26144

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separate out api group storage registration

Moves RESTStorage creation for API groups out of master.go proper and makes dependencies clear.  

This is prereq for being able to build the `RESTStorageProviders` as plugins.

@lavalamp This is the follow-on I promised.
@sttts ptal.

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optimise some code style in server.go

The PR modified some code style for authPathClientConfig and parseReservation function in server.go.

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[Federation] Downsize the release binary distribution.

There are two things that this PR implements:

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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Refactor uuid into its own pkg util/uuid

Continuing my work ref #15634

Anyone can review this if he/she wants.

Revert "Extend all to more resources"

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cluster/images/hyperkube: re-add hyperkube busybox style symlinks

Originally symlinks were added with a `--make-symlinks` command discussed in https://github.com/kubernetes/kubernetes/issues/24510 and implemented in https://github.com/kubernetes/kubernetes/pull/24511.

It was backed out in https://github.com/kubernetes/kubernetes/pull/25693 because go binaries don't run in qemu and this breaks cross-building the Dockerfile for arm. In this case, due to running `hyperkube --make-symlinks`.

Lets just add the symlinks manually until the upstream bug is fixed (qemu).

fixes #28702

@mikedanese @thockin @yifan-gu @euank