text: Title: clean usage of admissionregistration/v1beta1 from integration tests
  Body: This removes v1beta1 admission registration from integration tests.  The tests that are present to ensure migrated data works have been switched to use direct etcd access.
  
  /kind bug
  /priority important-soon
  @kubernetes/sig-apps-misc 
  
  ```release-note
  NONE
  ```