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Feature/kubeadm 594 etcd TLS on init/upgrade

**What this PR does / why we need it**:
On `kubeadm init`/`kubeadm upgrade`, this PR generates certificates for securing local etcd:
- etcd serving cert
- etcd peer cert
- apiserver etcd client cert

Flags and hostMounts are added to the etcd and apiserver static-pods to load these certs.
For connections to etcd, `https` is now used in favor of `http` and tests have been added/updated.

Etcd only listens on localhost, so the serving cert SAN defaults to `DNS:localhost,IP:127.0.0.1`.
The etcd peer cert has SANs for `<hostname>,<api-advertise-address>`, but is unused.

New kubeadm config options, `Etcd.ServerCertSANs` and `Etcd.PeerCertSANs`, are used for user additions to the default certificate SANs for the etcd server and peer certs.

This feature continues to utilize the existence of `MasterConfiguration.Etcd.Endpoints` as a feature gate for external-etcd.
If the user passes flags to configure `Etcd.{CAFile,CertFile,KeyFile}` but they omit `Endpoints`, these flags will be unused, and a warning is printed.

New phase commands:
```
kubeadm alpha phase certs etcd-server
kubeadm alpha phase certs etcd-peer
kubeadm alpha phase certs apiserver-etcd-client 
```

**Which issue(s) this PR fixes**
Fixes https://github.com/kubernetes/kubeadm/issues/594

**Special notes for your reviewer**:

#### on the master
these should fail:
```bash
curl localhost:2379/v2/keys  # no output
curl --cacert /etc/kubernetes/pki/ca.crt https://localhost:2379/v2/keys  # handshake error
```
these should succeed:
```
cd /etc/kubernetes/pki
curl --cacert ca.crt --cert apiserver-etcd-client.crt --key apiserver-etcd-client.key https://localhost:2379/v2/keys
```

**Release note**:
```release-note
On cluster provision or upgrade, kubeadm now generates certs and secures all connections to the etcd static-pod with mTLS.
```

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kubeadm: use localhost for API server liveness probe

**What this PR does / why we need it**:
The current liveness probe does not work with an HA cluster created with kubeadm. The probe's `host` value will be set to the IP address of the machine where `kubeadm --init` is run. For other master nodes, the IP address will be wrong.

**Special notes for your reviewer**:
None
**Release note**:
```release-note
NONE
```

/cc @timothysc

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Introduce External Metrics API

**What this PR does / why we need it**:
Introduce External Metrics API

This PR introduces External Metrics API which has been proposed: xref https://github.com/kubernetes/community/pull/1802

**Release note**:
```release-note
NONE
```

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Made a couple API changes to deviceplugin/v1beta1 to avoid future

incompatible API changes:
- Add GetDevicePluginOptions rpc call. This is needed when we switch
  from Registration service to probe-based plugin watcher.
- Change AllocateRequest and AllocateResponse to allow device requests
  from multiple containers in a pod. Currently only made mechanical
  change on the devicemanager and test code to cope with the API but
  still issues an Allocate call per container. We can modify the
  devicemanager in 1.11 to issue a single Allocate call per pod.
  The change will also facilitate incremental API change to communicate
  pod level information through Allocate rpc if there is such future
  need.



**What this PR does / why we need it**:
Made a couple API changes to deviceplugin/v1beta1 to avoid future incompatible API changes.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes https://github.com/kubernetes/kubernetes/issues/59370

**Special notes for your reviewer**:

**Release note**:

```release-note

```

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Add comments about potential race in delta fifo

**What this PR does / why we need it**:

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

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

/sig api-machinery

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[GCE] Refactor ExternalLoadBalancer Tests

**What this PR does / why we need it**:

- Refactors the ExternalLoadBalancer tests to use the generated GCE mock instead of FakeCloudAddressService, FakeCloudForwardingRuleService.
- Adds hooks to populate NetworkTier on Alpha resources
- Moves shared code to top of the external loadbalancer test file
- Moves NetworkTier into a constants file at the cloud level, so it is more easily called in subpackages

**Special notes for your reviewer**:

```release-note
NONE
```

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expunge the word 'manifest' from Kubelet's config API

The word 'manifest' technically refers to a container-group specification
that predated the Pod abstraction. We should avoid using this legacy
terminology where possible. Fortunately, the Kubelet's config API will
be beta in 1.10 for the first time, so we still had the chance to make
this change.

I left the flags alone, since they're deprecated anyway.

I changed a few var names in files I touched too, but this PR is the
just the first shot, not the whole campaign
(`git grep -i manifest | wc -l -> 1248`).

```release-note
Some field names in the Kubelet's now v1beta1 config API differ from the v1alpha1 API: PodManifestPath is renamed to PodPath, ManifestURL is renamed to PodURL, ManifestURLHeader is renamed to PodURLHeader.
```

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Promote configurable pod resolv.conf to Beta and add an e2e test

**What this PR does / why we need it**:
Feature issue: https://github.com/kubernetes/features/issues/504

There is no semantic changes. `CustomPodDNS` feature gate will be turned on by default.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #56521

**Special notes for your reviewer**:
/assign @bowei @thockin 

**Release note**:

```release-note
Adds BETA support for `DNSConfig` field in PodSpec and `DNSPolicy=None`.
```

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Implement a stub server printer for CRDs

This wires up TableConvertor to CRDs and puts a basic implementation in place for custom paths. However, since our OpenAPISchema can't store OpenAPI extension fields there is no way to expose the custom column piece that get.go supports today (`x-kubernetes-print-columns`). That piece can be implemented separately and needs discussion.

As this is purely exposing the default interface, very low risk. Will add an e2e test that covers this under a registered CRD.

@soltysh @sttts @kubernetes/sig-api-machinery-pr-reviews

A couple of options for wiring up the actual definition:

1. add a new "extensions" map to spec.validation
   1. Downside: won't handle future child nested fields, not the correct schema
2. try to change the OpenAPISchema3 field to support extensions
   1. Would require a breaking protobuf change, is also very difficult
   2. Could store the entire schema as opaque JSON and then parse on load (might be the right thing anyway)
3. Support this as an annotation in 1.11 - `alpha.customresource.k8s.io/x-kubernetes-print-columns` like the CLI

Part of #58536

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integration: refactor, cleanup, and add more tests for TokenRequest

ref #58790

```release-note
NONE
```

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Expose default service IP CIDR in apiserver

**What this PR does / why we need it**:
The `--service-cluster-ip-range` parameter of API server is very important for deploying Kubernetes on some clouds. The default CIDR "10.0.0.0/24" should be exposed at least from the API server's help message so that users have a better idea whether they need to change it.
This patch exposes this default value in API server's help message.

**Which issue this PR fixes** : fixes #51248

**Release note**:
```
NONE
```

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Allow TTLs to be plumbed through to webhook authn/authz in gce scripts.

Just allows these flags to be configured from the startup scripts.

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[garbage collector] fix log info

typo


**Release note**:

```release-note
NONE
```

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Indicate endpoint subsets are an optional field

Fixes #59403 

```release-note
NONE
```

Merge pull request #59882 from kris-nova/kubeadm-demote-controlplane-passthrough-flags-to-phases-alpha

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kubeadm: Demote controlplane passthrough flags to phases alpha

After a discussion in sig cluster lifecycle we agreed that the passthrough flags should live in phases alpha, and not be 1st class flags. They already exist in the alpha command, so just removing from here.



**What this PR does / why we need it**:

We introduced some flags as 1st class flags in #58080 and decided as a sig that the flags should only live in the `alpha` command. This PR removes the flags from the `init` command so they only exist in the `alpha` command

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

relates to kubernetes/kubernetes/pull/58080
fixes kubernetes/kubeadm/issues/676

**Special notes for your reviewer**:

This is a cosmetic change, and doesn't alter any functionality of the program, only the avenue in which a user access functionality in the program.

**Release note**:

```release-note
kubeadm: Demote controlplane passthrough flags to alpha flags
```

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DevicePlugins feature is beta in 1.10 release

**What this PR does / why we need it**:
Graduates DevicePlugins feature to beta.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes https://github.com/kubernetes/kubernetes/issues/56649

**Special notes for your reviewer**:

**Release note**:

```release-note
DevicePlugins feature graduates to beta.
```

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Only run connection-rejecting rules on new connections

Kube-proxy has two iptables chains full of rules to reject incoming connections to services that don't have any endpoints. Currently these rules get tested against all incoming packets, but that's unnecessary; if a connection to a given service has already been established, then we can't have been rejecting connections to that service. By only checking the first packet in each new connection, we can get rid of a lot of unnecessary checks on incoming traffic.

Fixes #56842

**Release note**:
```release-note
Additional changes to iptables kube-proxy backend to improve performance on clusters with very large numbers of services.
```

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e2e tests for multizone PDs

**What this PR does / why we need it**: e2e tests for multizone PDs.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
partially fixing #59988

/release-note-none

/assign @msau42 @saad-ali

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Adding credentials support for k8s core CSI  

PR implements changes proposed in: https://github.com/kubernetes/community/pull/1816

```release-note
CSI now allows credentials to be specified on CreateVolume/DeleteVolume, ControllerPublishVolume/ControllerUnpublishVolume, and NodePublishVolume/NodeUnpublishVolume operations
```

Add the plumbing for server side printing. Not connected until we
support a way to get OpenAPI extensions from CRDs.

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Update test framework featuregates type

**What this PR does / why we need it**:
A cleanup following #53025 and #57962.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
ref: #53025
and #57962.

**Special notes for your reviewer**:
but yeah, not sure if it's worthy to do this :)

**Release note**:

```release-note
NONE
```

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Disable mount propagation for windows containers

**What this PR does / why we need it**:

Windows containers don't support mount propagation. This PR disables it for windows containers.

Without this PR, windows containers creation would fail with error:

 Error: Error response from daemon: invalid bind mount spec "c:\\var\\lib\\kubelet\\pods\\a260a7c4-1852-11e8-bb1d-000d3a19c1da\\volumes\\kubernetes.io~secret\\default-token-rj7qv:c:/var/run/secrets/kubernetes.io/serviceaccount:ro,rslave": invalid volume specification: 'c:\var\lib\kubelet\pods\a260a7c4-1852-11e8-bb1d-000d3a19c1da\volumes\kubernetes.io~secret\default-token-rj7qv:c:\var\run\secrets\kubernetes.io\serviceaccount:ro,rslave'


**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #60274

**Special notes for your reviewer**:

**Release note**:

```release-note
Disable mount propagation for windows containers.
```

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Pass location parameter to event exporter.

**What this PR does / why we need it**:
This PR makes event-exporter export cluster location together with events.

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

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

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Namespace should support table printing

@soltysh 

Part of #58536

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Improves backoff policy in JobController

**What this PR does / why we need it**:
This PR is fixing the issue: #56853, It improves the "Job backoff policy" when Job is configure to allow parallelism and few pods' Jobs failed but others succeed. 
Now, it checks if the number of pods succeeded increased since the last check. If yes the backoff delay is cleared. 

**Which issue(s) this PR fixes**:
Fixes #56853

**Special notes for your reviewer**:

**Release note**:
```release-note
NONE
```

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Fixes for HTTP/2 max streams per connection setting

**What this PR does / why we need it**:
This PR makes two changes.  One is to introduce a parameter
for the HTTP/2 setting that an api-server sends to its clients
telling them how many streams they may have concurrently open in
an HTTP/2 connection.  If left at its default value of zero,
this means to use the default in golang's HTTP/2 code (which
is currently 250; see https://github.com/golang/net/blob/master/http2/server.go).

The other change is to make the recommended options for an aggregated
api-server set this limit to 1000.  The limit of 250 is annoyingly low
for the use case of many controllers watching objects of Kinds served
by an aggregated api-server reached through the main api-server (in
its mode as a proxy for the aggregated api-server, in which it uses a
single HTTP/2 connection for all calls proxied to that aggregated
api-server).

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #60042

**Special notes for your reviewer**:

**Release note**:

```release-note
Introduced `--http2-max-streams-per-connection` command line flag on api-servers and set default to 1000 for aggregated API servers.
```

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Add description of MountOptions to StorageClass describe printer

**What this PR does / why we need it**:

Print `StorageClass.MountOptions` for `kubectl describe` command.

**Release note**:

```release-note
NONE
```

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initialize all known client auth plugins

**What this PR does / why we need it**:
`k8s.io/client-go/plugin/pkg/client/auth/plugins.go` has already initialized all known client auth plugins.

https://github.com/kubernetes/kubernetes/blob/ec77ddfe19166deebc4822c78407894dd58acae1/staging/src/k8s.io/client-go/plugin/pkg/client/auth/plugins.go#L19-L25

We just need import `k8s.io/client-go/plugin/pkg/client/auth` instead.

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

**Special notes for your reviewer**:

**Release note**:

```release-note
None
```

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Add a metric exposing number of objects per type

Fix #51953

Adds a goroutine that periodically checks the count of objects in etcd and publishes a metric with this data.

```release-note
APIserver backed by etcdv3 exports metric showing number of resources per kind
```

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apiserver: fix testing etcd config in preparation for etcd 3.2.16+

The AuthToken must be set, also in non-https mode. Otherwise, etcd refuses to start.

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[kube-proxy]enhance kubeproxy init flag

**What this PR does / why we need it**:
 remove `TODO: once we switch everything over to Cobra commands, we can go back to calling
	utilflag.InitFlags() (by removing its pflag.Parse() call). For now, we have to set the
	 normalize func and add the go flag set by hand.`

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

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

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Updating GCE PD StorageClass parameters

**What this PR does / why we need it**: New parameter to improve support of multi-zone PDs.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*: partially addresses #59988

/cc @msau42 @saad-ali

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audit/request.go remove inaccurate TODO and fix typo

**What this PR does / why we need it**:

 remove one inaccurate `TODO` and fix a typo

**Release note**:

```release-note
NONE
```

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DaemonSet Controller and tests to apps/v1

**What this PR does / why we need it**:
Updates the DaemonSet controller, its integration tests, and its e2e tests to use the apps/v1 API.

**Release note**:
```release-note
The DaemonSet controller, its integration tests, and its e2e tests, have been updated to use the apps/v1 API.
```

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Fix image file system stats for windows nodes

**What this PR does / why we need it**:

Kubelet is reporting `invalid capacity 0 on image filesystem` on windows nodes and image GC always fails.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #59742

**Special notes for your reviewer**:

**Release note**:

```release-note
Fix image file system stats for windows nodes
```

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Delete stale UDP conntrack entries that use hostPort

**What this PR does / why we need it**:
This PR introduces a change to delete stale conntrack entries for UDP connections, specifically for udp connections that use hostPort. When the pod listening on that udp port get updated/restarted(and gets a new ip address), these entries need to be flushed so that ongoing udp connections can recover once the pod is back and the new iptables rules have been installed. 
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #59033

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

incompatible changes:
- Add GetDevicePluginOptions rpc call. This is needed when we switch
  from Registration service to probe-based plugin watcher.
- Change AllocateRequest and AllocateResponse to allow device requests
  from multiple containers in a pod. Currently only made mechanical
  change on the devicemanager and test code to cope with the API but
  still issues an Allocate call per container. We can modify the
  devicemanager in 1.11 to issue a single Allocate call per pod.
  The change will also facilitate incremental API change to communicate
  pod level information through Allocate rpc if there is such future
  need.