Updates Quantum with the latest changes from openstack-commons
notifier package:
Rename rabbit_notifier to rpc_notifier.
The previous rabbit_notifier module is generic and can be used
for all RPC notifications.
This commit moves the rabbit_notifier module to rpc_notifier and
adds a new deprecated rabbit_notifier module which can be used for
Grizzly so that users can have a chance to easily upgrade this
config setting.
Also updates the agent code and config file to reflect this change
(and get unit tests to pass)
Fixes LP Bug #1075330.
Change-Id: If9a4f5fa27638b25a29b66dbfed757554358ff7c
5b00256b98