Comment 24 for bug 1708976

Reviewed: https://review.openstack.org/491304
Committed: https://git.openstack.org/cgit/openstack/puppet-watcher/commit/?id=df39ae39bcd434228ca490eeda29d1aae581933f
Submitter: Jenkins
Branch: master

commit df39ae39bcd434228ca490eeda29d1aae581933f
Author: ZhongShengping <chdzsp@163.com>
Date: Mon Aug 7 09:18:13 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: I0c9bacd06490dfd5810e528f8dd0b630d33954c8
    Closes-Bug: #1708976