horizon 16.0.0.0rc1 release candidate

meta:version: 16.0.0.0rc1
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: Ivan Kolodyazhny <e0ne@e0ne.info>
meta:release:Change-Id: Ic6def256e1704ee80f7810f06d9032dddabfc65a
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>
meta:release:Code-Review+1: Akihiro Motoki <amotoki@gmail.com>
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