ceilometer 5.0.4 release

meta:version: 5.0.4
meta:series: liberty
meta:release-type: release
meta:announce: openstack-announce@lists.openstack.org
meta:pypi: no
meta:first: no
meta:release:Author: Julien Danjou <julien@danjou.info>
meta:release:Commit: Davanum Srinivas <davanum@gmail.com>
meta:release:Change-Id: I0d7432146510ef714d16b128c89d4f9f49fb124b
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