horizon 15.0.0.0rc1 release candidate

meta:version: 15.0.0.0rc1
meta:diff-start: -
meta:series: stein
meta:release-type: release candidate
meta:pypi: no
meta:first: no
meta:release:Author: Kendall Nelson <kennelson11@gmail.com>
meta:release:Commit: Ivan Kolodyazhny <e0ne@e0ne.info>
meta:release:Change-Id: Ie0e6535e196352f5b8edeafb994c396ba711cbf8
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>
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