Disable notifications for cinder when no consumer
Disable notifications for cinder when no consumer

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

dardelean/kolla-ansible,dardelean/kolla-ansible,dardelean/kolla-ansible