Merge branch 'stable-2.16' into stable-3.0

* stable-2.16:
  Set version to 2.16.28-SNAPSHOT
  Set version to 2.16.27
  ForRef#check should permit internal users to read all refs
  Use NoteDb sequence seed for groups sequence initialization
  GroupsOnInit: Remove unused dependency on ReviewDb
  Use NoteDb sequence seed for accounts sequence initialization
  Do not use ReviewDb anymore when is disabled

Change-Id: I334cb0a289d0cf840f0ba2db8de0571cba825979