Merge pull request #54957 from apelisse/update-kube-openapi

Automatic merge from submit-queue (batch tested with PRs 55004, 54957). 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>.

Update kube-openapi to use validation

**What this PR does / why we need it**: Moves openapi validation code to kube-openapi, so that we can move the rest of the code to apimachinery repository, so that later we can use it from both the client and the 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 #Nothing

**Special notes for your reviewer**:

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

Kubernetes-commit: 55e216f56eac0082acc6be655d9ae09cf9ba38a8

vendor/k8s.io/api/scheduling/v1alpha1/register.go

@@ -41,7 +41,7 @@ var (
 	AddToScheme        = localSchemeBuilder.AddToScheme
 )
 
-// Adds the list of known types to api.Scheme.
+// Adds the list of known types to the given scheme.
 func addKnownTypes(scheme *runtime.Scheme) error {
 	scheme.AddKnownTypes(SchemeGroupVersion,
 		&PriorityClass{},