This commit introduces separate oslo.messaging services in place of
a single rabbitmq server. This enables the separation of rpc and
notifications, the continued use of single rabbitmq server as well
as the use of alternative oslo.messaging drivers/backends.
This patch:
* adds oslo_messaging_* hiera parameters
* update rabbitmq and qdrourterd services
* add release note
Depends-On: I03e99d35ed043cf11bea9b7462058bd80f4d99da
Depends-On: I934561612d26befd88a9053262836b47bdf4efb0
Change-Id: Ie181a92731e254b7f613ad25fee6cc37e985c315