Replace cluster object's host with service_topic_queue
Replace cluster object's host with service_topic_queue

We have upgrade OVO's 'host' attribute  by 'service_topic_queue'
when sending rpc messages to support cluster deployment, there
are some left unchanged, fix it.

TrivialFix

Change-Id: I842a15290599181d8d20eb436764764fc9f10687

mahak/cinder,openstack/cinder,phenoxim/cinder,mahak/cinder,phenoxim/cinder,openstack/cinder