ceilometer 13.1.0 release

meta:version: 13.1.0
meta:diff-start: -
meta:series: train
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: Pierre Riteau <pierre@stackhpc.com>
meta:release:Commit: Pierre Riteau <pierre@stackhpc.com>
meta:release:Change-Id: I6b128ff0d22ce13e1245a4c55ce608142564207d
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: Hervé Beraud <hberaud@redhat.com>
meta:release:Workflow+1: Hervé Beraud <hberaud@redhat.com>
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