Let the initializer admission plugin set the metadata.intializers to nil

if an update makes the pendings and the result both nil

plugin/pkg/admission/initialization/initialization.go

@@ -208,6 +208,9 @@ func (i *initializer) Admit(a admission.Attributes) (err error) {
 
 		glog.V(5).Infof("Modifying uninitialized resource %s", a.GetResource())
 
+		if updated != nil && len(updated.Pending) == 0 && updated.Result == nil {
+			accessor.SetInitializers(nil)
+		}
 		// because we are called before validation, we need to ensure the update transition is valid.
 		if errs := validation.ValidateInitializersUpdate(updated, existing, initializerFieldPath); len(errs) > 0 {
 			return errors.NewInvalid(a.GetKind().GroupKind(), a.GetName(), errs)