This commit introduces oslo.messaging services in place of a single
rabbitmq server. This will enable the separation of rpc and
notifications for the continued use of a single backend (e.g.
rabbitmq server) or a dual backend for the messaging communications.
This patch:
* add oslo_messaging_rpc and oslo_messaging_notify services
* add puppet services for rpc and notification
(rabbitmq and qdrouterd servers)
* add docker services to deploy rpc (rabbitmq or qdrouterd)
and notify (rabbitmq or shared)
* retains rabbit parameters for core services
* update resource registries, service_net_map, roles, etc.
* update ci environment container scenarios
* add environment generator for messaging
* add release note
Depends-On: Ic2c1a58526febefc1703da5fec12ff68dcc0efa0
Depends-On: I154e2fe6f66b296b9b643627d57696e5178e1815
Depends-On: I03e99d35ed043cf11bea9b7462058bd80f4d99da
Needed-By: Ie181a92731e254b7f613ad25fee6cc37e985c315
Change-Id: I934561612d26befd88a9053262836b47bdf4efb0
78bc457585