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/apimachinery/pkg/apis/meta/v1/generated.proto

@@ -149,6 +149,10 @@ message DeleteOptions {
   // Either this field or OrphanDependents may be set, but not both.
   // The default policy is decided by the existing finalizer set in the
   // metadata.finalizers and the resource-specific default policy.
+  // Acceptable values are: 'Orphan' - orphan the dependents; 'Background' -
+  // allow the garbage collector to delete the dependents in the background;
+  // 'Foreground' - a cascading policy that deletes all dependents in the
+  // foreground.
   // +optional
   optional string propagationPolicy = 4;
 }