keystone 20.0.0.0rc1 release candidate

meta:version: 20.0.0.0rc1
meta:diff-start: -
meta:series: xena
meta:release-type: release candidate
meta:pypi: no
meta:first: no
meta:release:Author: Hervé Beraud <hberaud@redhat.com>
meta:release:Commit: Hervé Beraud <hberaud@redhat.com>
meta:release:Change-Id: Ie2aac664555e3c5b4c9d730f55429cbc9323be87
meta:release:Code-Review+1: Gage Hugo <gagehugo@gmail.com>
meta:release:Code-Review+2: Hervé Beraud <herveberaud.pro@gmail.com>
meta:release:Code-Review+2: Elod Illes <elod.illes@est.tech>
meta:release:Workflow+1: Elod Illes <elod.illes@est.tech>