Merge pull request #40862 from shashidharatd/kubefed-3

Automatic merge from submit-queue (batch tested with PRs 40862, 40909)

[Federation][kubefed] Add option to disable persistence storage for etcd

**What this PR does / why we need it**:
This is part of updates to enable deployment of federation on non-cloud environments. This pr enables disabling persistent storage for etcd via kubefed.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #40617

**Special notes for your reviewer**:

**Release note**:
```
[Federation] Add --etcd-persistent-storage flag to kubefed to enable/disable persistent storage for etcd
```
cc: @kubernetes/sig-federation-bugs @madhusudancs

hack/verify-flags/known-flags.txt

@@ -176,6 +176,7 @@ etcd-keyfile
 etcd-mutation-timeout
 etcd-prefix
 etcd-pv-capacity
+etcd-persistent-storage
 etcd-quorum-read
 etcd-server
 etcd-servers