Merge pull request #67372 from tanshanshan/priority-814

Automatic merge from submit-queue (batch tested with PRs 67137, 67372, 67505, 67373, 67357). 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 apiserver crashed when priority classs already exists

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

when priority classs already exists , ignore error 

**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 #67367 

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

pkg/registry/scheduling/rest/storage_scheduling.go

@@ -85,7 +85,7 @@ func AddSystemPriorityClasses() genericapiserver.PostStartHookFunc {
 				if err != nil {
 					if apierrors.IsNotFound(err) {
 						_, err := schedClientSet.PriorityClasses().Create(pc)
-						if err != nil {
+						if err != nil && !apierrors.IsAlreadyExists(err) {
 							return false, err
 						} else {
 							glog.Infof("created PriorityClass %s with value %v", pc.Name, pc.Value)