DO NOT MERGE cherry picking from MR0 cl 148223

Showing a congratulations screen after choosing face unlock backup lock

Once a backup lock has been chosen, it sends an intent to show a
congratulations screen.  The moveTempGallery function has been moved
inside this new activity so it is no longer needed in LockPatternUtils.

Change-Id: I66868e6e3391b8b740f618fe633047ce388f55ca