Should switch to get_notification_listener function for creating oslo.messaging serer

https://review.openstack.org/#/c/297988/ — this commit changes public interfaces of several classes in a backwards-incompatible way.
https://review.openstack.org/#/c/297988/9/oslo_messaging/notify/dispatcher.py here NotificationDispatcher used to accept 5 obligatory params and now it only accpets 3.
This would cause major problems for murano, since we use the library here https://github.com/openstack/murano/blob/master/murano/common/server.py#L231 and the change is backward-incompatible.
This would probably mean that the next release of oslo.messaging would be a major one, but nevertheless it would break murano code.

We should switch to using https://github.com/openstack/oslo.messaging/blob/master/oslo_messaging/notify/listener.py#L186 get_notification_listener func, since oslo folks believe it would be left unchanged across major releases.