trove 15.0.0.0rc1 release candidate

meta:version: 15.0.0.0rc1
meta:diff-start: -
meta:series: wallaby
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: Idf35786e887b7cd2a94544e35e03bb244a6634ad
meta:release:Code-Review+1: Lingxian Kong <anlin.kong@gmail.com>
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: Thierry Carrez <thierry@openstack.org>
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