Update strings like 'openstack.common.notifier.driver'.
Update strings like 'openstack.common.notifier.driver'.

I was running into trouble with driver names that were generically named
in common but need to point to specific objects within nova.

Change-Id: Ie75761c73a855b067b1bcec651a1bb998deba9f4

JioCloud/oslo-incubator,JioCloud/oslo-incubator,JioCloud/oslo-incubator