nova 21.0.0 release

meta:version: 21.0.0
meta:diff-start: 20.0.0.0rc1
meta:series: ussuri
meta:release-type: release
meta:pypi: no
meta:first: yes
meta:release:Author: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Commit: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Change-Id: I66602ca7a6ab1af35bf33d4d82fe34191f2e3865
meta:release:Code-Review+1: Michał Dulko <mdulko@redhat.com>
meta:release:Code-Review+1: Hongbin Lu <hongbin034@gmail.com>
meta:release:Code-Review+1: Lingxian Kong <anlin.kong@gmail.com>
meta:release:Code-Review+1: Brian Rosmaita <rosmaita.fossdev@gmail.com>
meta:release:Code-Review+1: Trinh Nguyen <dangtrinhnt@gmail.com>
meta:release:Code-Review+1: Feilong Wang <flwang@catalyst.net.nz>
meta:release:Code-Review+1: Yasufumi Ogawa <yasufum.o@gmail.com>
meta:release:Code-Review+1: gecong <ge.cong@zte.com.cn>
meta:release:Code-Review+1: licanwei <li.canwei2@zte.com.cn>
meta:release:Code-Review+1: XueFeng Liu <liu.xuefeng1@zte.com.cn>
meta:release:Code-Review+1: Abhishek Kekane <akekane@redhat.com>
meta:release:Code-Review+1: Andrey Pavlov <andrey.mp@gmail.com>
meta:release:Code-Review+1: Tom Barron <tpb@dyncloud.net>
meta:release:Code-Review+1: Nicolas Bock <nicolasbock@gmail.com>
meta:release:Code-Review+1: Carlos Goncalves <cgoncalves@redhat.com>
meta:release:Code-Review+1: Rico Lin <rico.lin.guanyu@gmail.com>
meta:release:Code-Review+1: zhurong <aaronzhu1121@gmail.com>
meta:release:Code-Review+1: Lucian Petrut <lpetrut@cloudbasesolutions.com>
meta:release:Code-Review+1: wanghao <sxmatch1986@gmail.com>
meta:release:Code-Review+1: Slawek Kaplonski <skaplons@redhat.com>
meta:release:Code-Review+1: Kota Tsuyuzaki <kota.tsuyuzaki.pc@hco.ntt.co.jp>
meta:release:Code-Review+1: Pierre Riteau <pierre@stackhpc.com>
meta:release:Code-Review+1: Tetsuro Nakamura <tetsuro.nakamura.bc@hco.ntt.co.jp>
meta:release:Code-Review+1: Akihiro Motoki <amotoki@gmail.com>
meta:release:Code-Review+1: Martin Chacon Piza <MartinDavid.ChaconPiza1@est.fujitsu.com>
meta:release:Code-Review+1: Sylvain Bauza <sbauza@redhat.com>
meta:release:Code-Review+1: Goutham Pacha Ravi <gouthampravi@gmail.com>
meta:release:Code-Review+1: Michael Johnson <johnsomor@gmail.com>
meta:release:Code-Review+1: Sampath Priyankara (samP) <sam47priya@gmail.com>
meta:release:Code-Review+1: Graham Hayes <gr@ham.ie>
meta:release:Code-Review+1: Andreas Jaeger <jaegerandi@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: Hervé Beraud <hberaud@redhat.com>
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