BUG-432: migrate users of Registration as appropriate

This patch adjust all users to the non-generic nator of Registration,
plus migrates a few to ListenerRegistration.

Change-Id: I69c1c61890f866d24a4b50e685bddba32bac7815
Signed-off-by: Robert Varga <rovarga@cisco.com>
Merge "BUG-432: migrate users of Registration as appropriate"