Automatic merge from submit-queue

ObjectMeta, ListMeta, and TypeMeta should implement their interfaces

Make unversioned.ListMeta implement List. Update all the *List types so they implement GetListMeta.
This helps avoid using reflection to get list information.

Remove all unnecessary boilerplate, move the interfaces to the right
places, and add a test that verifies that objects implement one, the
other, but never both.

@ncdc @lavalamp this supercedes #26964 with the boilerplate removed.  Added tests