cliff 2.3.0 release

meta:version: 2.3.0
meta:diff-start: -
meta:series: ocata
meta:release-type: release
meta:announce: openstack-announce@lists.openstack.org
meta:pypi: yes
meta:first: yes
meta:release:Author: Steve Martinelli <s.martinelli@gmail.com>
meta:release:Commit: Steve Martinelli <s.martinelli@gmail.com>
meta:release:Change-Id: I38614d8a25eedd7118dce1213e8d7e97c8d62fe4
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>
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