Bug 509: Fixed order of invoking Schema listeners.

Explicitly registered SchemaServiceListeners
are invoked before listeners picked-up by whiteboard
pattern, which by default are not aware
of the service.

Change-Id: Id41b89a1ba2ccb5323d5ab5ad8a95d2048776679
Signed-off-by: Tony Tkacik <ttkacik@cisco.com>
Merge "Bug 509: Fixed order of invoking Schema listeners."