neutron 15.0.0 release

meta:version: 15.0.0
meta:diff-start: 14.0.0
meta:series: train
meta:release-type: release
meta:pypi: no
meta:first: yes
meta:release:Author: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Commit: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Change-Id: Icd4d3e6bc2bdd23b7073c38ea1a2e9100e679834
meta:release:Code-Review+1: Andrey Pavlov <andrey.mp@gmail.com>
meta:release:Code-Review+1: Pierre Riteau <pierre@stackhpc.com>
meta:release:Code-Review+1: Eric Fried <openstack@fried.cc>
meta:release:Code-Review+1: Douglas Mendizábal <dmendiza@redhat.com>
meta:release:Code-Review+1: Lucian Petrut <lpetrut@cloudbasesolutions.com>
meta:release:Code-Review+1: Jay Bryant <jungleboyj@electronicjungle.net>
meta:release:Code-Review+1: Goutham Pacha Ravi <gouthampravi@gmail.com>
meta:release:Code-Review+1: Nicolas Bock <nicolasbock@gmail.com>
meta:release:Code-Review+1: Claudiu Belu <cbelu@cloudbasesolutions.com>
meta:release:Code-Review+1: Akihiro Motoki <amotoki@gmail.com>
meta:release:Code-Review+1: Michael Johnson <johnsomor@gmail.com>
meta:release:Code-Review+1: Jeremy Freudberg <jeremyfreudberg@gmail.com>
meta:release:Code-Review+1: Sundar Nadathur <sundar.nadathur@intel.com>
meta:release:Code-Review+1: Ivan Kolodyazhny <e0ne@e0ne.info>
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+1: licanwei <li.canwei2@zte.com.cn>
meta:release:Code-Review+1: Brin Zhang <zhangbailin@inspur.com>
meta:release:Code-Review+1: Slawek Kaplonski <skaplons@redhat.com>
meta:release:Code-Review+1: dharmendra kushwaha <dharmendra.kushwaha@gmail.com>
meta:release:Code-Review+1: Luka Peschke <luka.peschke@objectif-libre.com>
meta:release:Code-Review+1: Carlos Goncalves <cgoncalves@redhat.com>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Code-Review+1: Chris Dent <cdent@anticdent.org>
meta:release:Workflow+1: Sean McGinnis <sean.mcginnis@gmail.com>
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