Comment 18 for bug 1708976

Reviewed: https://review.openstack.org/491365
Committed: https://git.openstack.org/cgit/openstack/puppet-tacker/commit/?id=032cc767bed91f030a0c10757096c75db63e22b8
Submitter: Jenkins
Branch: master

commit 032cc767bed91f030a0c10757096c75db63e22b8
Author: ZhongShengping <chdzsp@163.com>
Date: Mon Aug 7 14:34:01 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: Iad4cb043fac8690d3ab076fa54fe4e1bb2fea110
    Closes-Bug: #1708976