ceilometer 8.1.5 release

meta:version: 8.1.5
meta:diff-start: -
meta:series: ocata
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: Julien Danjou <julien@danjou.info>
meta:release:Commit: Julien Danjou <julien@danjou.info>
meta:release:Change-Id: I9269f99f7958c31acdc3738917e4f892fd679f77
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Workflow+1: Sean McGinnis <sean.mcginnis@gmail.com>
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