nova 20.0.0.0rc1 release candidate

meta:version: 20.0.0.0rc1
meta:diff-start: -
meta:series: train
meta:release-type: release candidate
meta:pypi: no
meta:first: no
meta:release:Author: Jean-Philippe Evrard <jean-philippe@evrard.me>
meta:release:Commit: Matt Riedemann <mriedem.os@gmail.com>
meta:release:Change-Id: I06a8ebc519aed07fe20aa0d127f134b0ff86fc06
meta:release:Code-Review+1: Matt Riedemann <mriedem.os@gmail.com>
meta:release:Code-Review+1: Eric Fried <openstack@fried.cc>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Code-Review+1: Takashi NATSUME <natsume.takashi@lab.ntt.co.jp>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>
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