Comment 32 for bug 1708976

Reviewed: https://review.openstack.org/491347
Committed: https://git.openstack.org/cgit/openstack/puppet-congress/commit/?id=714978792e1d4fe8de0ddab44a2156dc799196d5
Submitter: Jenkins
Branch: master

commit 714978792e1d4fe8de0ddab44a2156dc799196d5
Author: ZhongShengping <chdzsp@163.com>
Date: Mon Aug 7 13:49:33 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: I0ba609ca5c311b52635efd3c3364a258fd197d5f
    Closes-Bug: #1708976