horizon 15.0.0 release

meta:version: 15.0.0
meta:diff-start: 14.0.0.0rc1
meta:series: stein
meta:release-type: release
meta:pypi: no
meta:first: yes
meta:release:Author: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Commit: Thierry Carrez <thierry@openstack.org>
meta:release:Change-Id: I2717755ff6e525a4075cf5f6397c0c1d1d45e170
meta:release:Code-Review+1: Tom Barron <tpb@dyncloud.net>
meta:release:Code-Review+1: dharmendra kushwaha <dharmendra.kushwaha@india.nec.com>
meta:release:Code-Review+1: Ivan Kolodyazhny <e0ne@e0ne.info>
meta:release:Code-Review+1: Akihiro Motoki <amotoki@gmail.com>
meta:release:Code-Review+1: zhurong <aaronzhu1121@gmail.com>
meta:release:Code-Review+1: Chris Dent <cdent@anticdent.org>
meta:release:Code-Review+1: Graham Hayes <gr@ham.ie>
meta:release:Code-Review+1: Luka Peschke <luka.peschke@objectif-libre.com>
meta:release:Code-Review+1: Pierre Riteau <pierre@stackhpc.com>
meta:release:Code-Review+1: Li Liu <liliueecg@gmail.com>
meta:release:Code-Review+1: Ghanshyam Mann <gmann@ghanshyammann.com>
meta:release:Code-Review+1: Eric Fried <openstack@fried.cc>
meta:release:Code-Review+1: melanie witt <melwittt@gmail.com>
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: Renat Akhmerov <renat.akhmerov@gmail.com>
meta:release:Code-Review+1: Colleen Murphy <colleen@gazlene.net>
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Code-Review+2: Kendall Nelson <kennelson11@gmail.com>
meta:release:Code-Review+2: Jean-Philippe Evrard <jean-philippe@evrard.me>
meta:release:Code-Review+2: Tony Breeds <tony@bakeyournoodle.com>
meta:release:Code-Review+1: Erno Kuvaja <jokke@usr.fi>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Sean McGinnis <sean.mcginnis@gmail.com>
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