Notifications for cinder is not disabled when there is no other consuming
project, it's better to disable that to reduce some pressure for the message
bus[1].

[1]:
http://docs.openstack.org/developer/oslo.messaging/FAQ.html#i-don-t-need-notifications-on-the-message-bus-how-do-i-disable-them

Change-Id: I41c16b4ef6437b0104d4f37daa8b8640db7fdd50
Closes-bug: #1642440