ceilometer 13.0.0.0rc1 release candidate

meta:version: 13.0.0.0rc1
meta:diff-start: -
meta:series: train
meta:release-type: release candidate
meta:pypi: no
meta:first: no
meta:release:Author: Jean-Philippe Evrard <jean-philippe@evrard.me>
meta:release:Commit: zhurong <aaronzhu1121@gmail.com>
meta:release:Change-Id: Ie5919ae5dfca1fe06bf2c4badfa558e552141782
meta:release:Code-Review+1: zhurong <aaronzhu1121@gmail.com>
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>
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