keystone 27.0.0.0rc1 release candidate

meta:version: 27.0.0.0rc1
meta:team: keystone
meta:diff-start: -
meta:series: epoxy
meta:branch: master
meta:release-type: release candidate
meta:pypi: no
meta:first: no
meta:release:Author: Elod Illes <elod.illes@est.tech>
meta:release:Commit: Elod Illes <elod.illes@est.tech>
meta:release:Change-Id: Ie54537e5b97cb31e994aa93458fd3481b2e3c768
meta:release:Code-Review+1: Artem Goncharov <artem.goncharov@gmail.com>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>
meta:release:Code-Review+2: Elod Illes <elod.illes@est.tech>