Use messaging notifications transport instead of default

[Kirill Bespalov]

The usage of oslo_messaging.get_transport is not meant for
notifications.

And oslo_messaging.get_notification_transport is
favored for those means if we want to use different drivers
for RPC and notifications (e.g. rabbit and kafka).

Other projects already do it in the master:

1) ironic https://review.openstack.org/#/c/322639/
2) cinder https://review.openstack.org/#/c/301182/
3) heat https://review.openstack.org/#/c/305696/
4) keystone https://review.openstack.org/#/c/301193/
5) glance https://review.openstack.org/#/c/300313/

and in the Mitaka:

1) nova https://review.openstack.org/#/c/266960/
2) neutron https://review.openstack.org/#/c/268335/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/365680
Committed: https://git.openstack.org/cgit/openstack/murano/commit/?id=c188b5cd121d9637c054d2ee593356dceb6fd58d
Submitter: Jenkins
Branch: master

commit c188b5cd121d9637c054d2ee593356dceb6fd58d
Author: kbespalov <email address hidden>
Date: Mon Sep 5 17:18:15 2016 +0300

    [messaging] Using get_notification_transport()

    We should separate transports for the RPC and Notifiers
    in order to have a possibility of using different messaging
    configurations, like rabbit for RPC and kafka for notifications.

    e.g.

    [DEFAULT]
    rpc_backend = rabbit

    [oslo_messaging_rabbit]
    rabbit_hosts = ...
    rabbit_password = ...
    rabbit_userid = ...

    [oslo_messaging_notifications]
    driver = ...
    transport_url = kafka://...
    topics = ...

    Change-Id: I965fdb4bb1883d05c43766cf12d620d7ab038e36
    Closes-Bug: #1620545

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/372985

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/372985
Committed: https://git.openstack.org/cgit/openstack/murano/commit/?id=77416f25e033fd7acbb0349d1cd548838203cdaf
Submitter: Jenkins
Branch: master

commit 77416f25e033fd7acbb0349d1cd548838203cdaf
Author: LiuNanke <email address hidden>
Date: Tue Sep 20 15:31:48 2016 +0800

    [messaging] Using get_notification_transport()

    We should separate transports for the RPC and Notifiers
    in order to have a possibility of using different messaging
    configurations, like rabbit for RPC and kafka for notifications.

    e.g.

    [DEFAULT]
    rpc_backend = rabbit

    [oslo_messaging_rabbit]
    rabbit_hosts = ...
    rabbit_password = ...
    rabbit_userid = ...

    [oslo_messaging_notifications]
    driver = ...
    transport_url = kafka://...
    topics = ...

    Change-Id: I54b7681b059991eafe5899b3d0cffdcd5c80fb39
    Closes-Bug: #1620545

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/murano 3.1.0 release.