Comment 23 for bug 1708976

Reviewed: https://review.openstack.org/491362
Committed: https://git.openstack.org/cgit/openstack/puppet-sahara/commit/?id=0f5fbf7a508a0f68129e51213d6ce69cc87ead85
Submitter: Jenkins
Branch: master

commit 0f5fbf7a508a0f68129e51213d6ce69cc87ead85
Author: ZhongShengping <chdzsp@163.com>
Date: Mon Aug 7 14:25:11 2017 +0800

    Deprecate oslo.messaging rpc_backend option parameter

    Oslo.messaging uses the transport_url to represent the rpc and
    notification messaging driver to use and its full configuration. The
    rpc_backend configuration option is deprecated for removal and
    should not gate oslo.messaging driver configuration options.

    This patch:
    * deprecate rpc_backend
    * remove conditional check
    * update spec tests
    * add release note

    Change-Id: Ic283faf4f04a9fc434a6cc1fa530ea25b2eda430
    Closes-Bug: #1708976