cliff 2.1.0 release

meta:version: 2.1.0
meta:series: newton
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: Id67c18cca8bdba2d968bfdfb2c9b437dbca8cc04
meta:release:Code-Review+1: Vincent Legoll <vincent.legoll@iphc.cnrs.fr>
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>
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