python-keystoneclient 3.21.0 release

meta:version: 3.21.0
meta:diff-start: -
meta:series: train
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Colleen Murphy <colleen.murphy@suse.de>
meta:release:Commit: Colleen Murphy <colleen.murphy@suse.de>
meta:release:Change-Id: I6f42108536701406ad3d76adffd5616df512d0b2
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Code-Review+2: Jean-Philippe Evrard <jean-philippe@evrard.me>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>
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