Moved all flag code from `staging/src/k8s.io/apiserver/pkg/util/[flag|globalflag]` to `component-base/cli/[flag|globalflag]` except for the term function because of unwanted dependencies.
The storage version now is solely decided by the
scheme.PrioritizedVersionsForGroup(). For cohabitating resources, the storage
version will be that of the overriding group as returned by
storageFactory.getStorageGroupResource().
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Synchronous & unbatched audit log writes
**What this PR does / why we need it**:
When enabling buffered audit log file writes to reduce latency under high load, we shouldn't be batching the writes, as the large data write can have an inverse (though unpredictable) impact. Additionally, batched audit log writes should not be done asynchronously, as this just creates lock contention on the log writer.
This is a clean-ed up version of https://github.com/kubernetes/kubernetes/pull/61217
**Which issue(s) this PR fixes**
Fixes#61932
**Release note**:
```release-note
NONE
```
/sig auth
/priority important-soon
/kind bug
/milestone v1.12
Automatic merge from submit-queue (batch tested with PRs 66196, 67016, 66807, 67023). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
fix spelling mistakes
**What this PR does / why we need it**:
fix spelling mistakes
**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
```
Automatic merge from submit-queue (batch tested with PRs 63315, 63383, 63318, 63439). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Re-enable lease reconciler, fix shutdown race
Fixes#63378Fixes#57617
* Fixes the openapi script to wait for the apiserver on shutdown (like all the other scripts do)
* Fixes the apiserver shutdown to not hang forever if the kubernetes service reconciler cannot persist to etcd
* Readds https://github.com/kubernetes/kubernetes/pull/58474 to make the default the lease reconciler
```release-note
kube-apiserver: the default `--endpoint-reconciler-type` is now `lease`. The `master-count` endpoint reconciler type is deprecated and will be removed in 1.13.
```
Automatic merge from submit-queue (batch tested with PRs 62655, 61711, 59122, 62853, 62390). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Implemented truncating audit backend
Fixes https://github.com/kubernetes/kubernetes/issues/60432
Introduces an optional truncating backend, disabled by default, that estimates the size of audit events and truncates events/split batches based on the configuration.
/cc @sttts @tallclair @CaoShuFeng @ericchiang
```release-note
Introduce truncating audit backend that can be enabled for existing backend to limit the size of individual audit events and batches of events.
```
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kube-apiserver add BuiltInAuthorizationOptions validation
Validate BuiltInAuthorizationOptions after flags parsed.
**Release note**:
```release-note
NONE
```
Automatic merge from submit-queue (batch tested with PRs 59882, 59434, 57722, 60320, 51249). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
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
```
