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Make PD E2E Tests Wait for Detach to Prevent Kernel Errors

Fixes https://github.com/kubernetes/kubernetes/issues/28854

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Added instructions on turning on dynamic provisioning for testing.

HostPath volumes are not automatically provisioned unless we pass in `--enable-hostpath-provisioner` to the controller manager. This was not mentioned in the docs previously, leading to questions like [this](https://groups.google.com/forum/#!searchin/kubernetes-dev/mysterious/kubernetes-dev/jVk_RgAkbaY/LRX7IuCEDQAJ).

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Only run federation tests if FEDERATION==true.

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Delete duplicated code

The code block below is called twice sequentially in func `doTestPlugin`.
.
```go
 	if _, err := os.Stat(path); err != nil {
 		if os.IsNotExist(err) {
 			t.Errorf("SetUp() failed, volume path not created: %s", path)
 		} else {
 			t.Errorf("SetUp() failed: %v", err)
 		}
 	}
```

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rkt: Copy the /etc/hosts /etc/resolv.conf into pod dir before mounting.

rkt: Copy the /etc/hosts /etc/resolv.conf into pod dir before mounting.
    
This enables the container to modify the /etc/hosts/ /etc/resolv.conf without changing the host's ones.
With this PR, we now match the docker's behavior.

Fix https://github.com/kubernetes/kubernetes/issues/29022

cc @kubernetes/sig-rktnetes @quentin-m 

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Scale kube-proxy conntrack limits by cores (new default behavior)

For large machines we want more conntrack entries than smaller machines.

Commence bike-shedding on names and values and semantics.  I'd love to get this in as a patch to 1.3.x since we have had some trouble for users on large machines.

Fixes #28867

This enables the container to modify the /etc/hosts/ /etc/resolv.conf
without changing the host's ones.

With this PR, we now match the docker's behavior.

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Fix a bug in mirror pod node e2e test.

Fixed a bug in test/e2e_node/mirror_pod_test.go. The function 'checkMirrorPodDisappear' returns nil even when the pod does not disappear. It should return a non-nil error. 

@Random-Liu 

For large machines we want more conntrack entries than smaller machines.

This is the same test we make everywhere else.  Only here were we
checking against the empty string.

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Undelete generated files

There's been enough people broken by not committing generated code, that we
should undo that until we have a proper client that is `go get` compatible.

This is temporary.

Fixes #28920

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Splitting OS_DISTRIBUTION into NODE_OS_DISTRIBUTION and MASTER_OS_DISTRIBUTION

fixes #26183 
[![Analytics](https://kubernetes-site.appspot.com/UA-36037335-10/GitHub/.github/PULL_REQUEST_TEMPLATE.md?pixel)]()

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Better handle etcd compaction in multi-apiserver

What:
- Change etcd compaction routine to better handle multi-apiserver (HA) scenarios. See the docs in code.

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Fix make to include line-continuations

This got broken in recent changes.  Sorry for the noise.

MASTER_OS_DISTRIBUTION.

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[Kubelet] Improving QOS in kubelet by introducing QoS level Cgroups - `--cgroups-per-qos`

This PR is tied to this upstream issue #27204 
Please note that only the last commit is unique to this PR. The first two commits are from previous PR's.

It introduces a new flag in the Kubelet which can be used to specify if the user wants to use the QoS cgroup hierarchy. 

cc @kubernetes/sig-node

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move api.ObjectReference.ObjectKind to pkg/api/ref.go

This is needed to convert k8s components to use versioned clientset.

To let components use versioned client, we need to convert `pkg/client/record` to v1, which depends on `pkg/api/ref.go`, so we need to make a `pkg/api/v1/ref.go`. And this [line](https://github.com/kubernetes/kubernetes/blob/master/pkg/api/ref.go#L44) requires v1.ObjectReference to be a runtime.Object. Moving `api.ObjectReference.ObjectKind` to `pkg/api/ref.go` will make the writing a conversion script easier because all the necessary changes will be restricted in `ref.go`.

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Fix build for non-GOPATH users

I want feedback on this.  There are 2 commits here, we should probably only do one of them.  The release note will depend on which one we choose.  Also docs need update.

Fixes #28890
Fixes #28987

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move kube-dns to the cluster/addons/ directory

Fixes #28553

cc @girishkalele @bprashanth 

There's been enough people broken by not committing generated code, that we
should undo that until we have a proper client that is `go get` compatible.

This is temporary.

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Reexport term.IsTerminal

Reexport term.IsTerminal so downstream consumers (e.g. OpenShift) can use it.

@smarterclayton @sttts 

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Few more optimizations of priority functions in scheduler

Ref #28590

@davidopp 

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First step of optimizing PodAffinity priority function

Ref #26144 

This is obviously only a first step - I will continue working on this code. However, this is changing the general scheme of computations to what is described in: https://github.com/kubernetes/kubernetes/issues/26144#issuecomment-232612384

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Fix make on Mac replacing sed with tr

fixes #28930

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Don't double encode protobuf runtime.Unknown

When using runtime.Object and runtime.RawExtension, passing
runtime.Unknown to protobuf serializer should result in the raw message
being serialized (since all normal protobuf objects are
runtime.Unknown).

Also, avoid setting a content-type when decoding a protobuf object
except when the content appears to be proto.

@wojtek-t

Fix the fix for taint scheduler predicate test

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Including ContainerRemoved in PLEG event reporting

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Defer taint removal in SchedulerPredictes

cc @davidopp @kevin-wangzefeng 

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Support deleting all unused images

#25239

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Generate a better Stringer method for proto types

This replaces the bad string output generated by golang/proto with gogo/protobuf stringer generation. Makes the output similar to %#v and more debuggable. We have to have a String() method to implement proto.Message, so this is strictly better.

@wojtek-t, @thockin for after your PR merges

Fixes #28756