horizon 15.0.0.0rc2 release candidate

meta:version: 15.0.0.0rc2
meta:diff-start: -
meta:series: stein
meta:release-type: release candidate
meta:pypi: no
meta:first: no
meta:release:Author: Ivan Kolodyazhny <e0ne@e0ne.info>
meta:release:Commit: Ivan Kolodyazhny <e0ne@e0ne.info>
meta:release:Change-Id: I3d2d2edb081130211eb379c460aa9a8bbabc762c
meta:release:Code-Review+1: Akihiro Motoki <amotoki@gmail.com>
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Workflow+1: Sean McGinnis <sean.mcginnis@gmail.com>
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