cliff 3.1.0 release

meta:version: 3.1.0
meta:diff-start: -
meta:series: ussuri
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Monty Taylor <mordred@inaugust.com>
meta:release:Commit: Thierry Carrez <thierry@openstack.org>
meta:release:Change-Id: I90fc4794242683d632602e4fc083e557fb48e65f
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>
meta:release:Code-Review+1: Andreas Jaeger <jaegerandi@gmail.com>
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