keystone 20.0.0 release

meta:version: 20.0.0
meta:diff-start: 19.0.0.0rc1
meta:series: xena
meta:release-type: release
meta:pypi: no
meta:first: yes
meta:release:Author: Hervé Beraud <hberaud@redhat.com>
meta:release:Commit: Hervé Beraud <hberaud@redhat.com>
meta:release:Change-Id: Ic315f2d0b9377975a9cf72fe284f71cb090ace5c
meta:release:Code-Review+1: Balazs Gibizer <balazs.gibizer@est.tech>
meta:release:Code-Review+1: sean mooney <smooney@redhat.com>
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Code-Review+1: Brian Rosmaita <rosmaita.fossdev@gmail.com>
meta:release:Code-Review+1: Sylvain Bauza <sbauza@redhat.com>
meta:release:Code-Review+2: Elod Illes <elod.illes@est.tech>
meta:release:Code-Review+2: Hervé Beraud <herveberaud.pro@gmail.com>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Hervé Beraud <herveberaud.pro@gmail.com>
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