nova 15.0.0 release

meta:version: 15.0.0
meta:diff-start: 14.0.0.0rc1
meta:series: ocata
meta:release-type: release
meta:pypi: no
meta:first: yes
meta:release:Author: Doug Hellmann <doug@doughellmann.com>
meta:release:Commit: Doug Hellmann <doug@doughellmann.com>
meta:release:Change-Id: I4aad8807dc7f0d8b4988432dad952c588a2445d2
meta:release:Code-Review+1: Dave McCowan <dmccowan@cisco.com>
meta:release:Code-Review+1: Michael Johnson <johnsomor@gmail.com>
meta:release:Code-Review+1: Dariusz Smigiel <smigiel.dariusz@gmail.com>
meta:release:Code-Review+1: Sylvain Bauza <sbauza@redhat.com>
meta:release:Code-Review+1: Richard Jones <r1chardj0n3s@gmail.com>
meta:release:Code-Review+1: Kevin Benton <kevin@benton.pub>
meta:release:Code-Review+1: Brian Rosmaita <brian.rosmaita@rackspace.com>
meta:release:Code-Review+1: Matt Riedemann <mriedem@us.ibm.com>
meta:release:Code-Review+1: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Code-Review+1: Pierre Mathieu <pierre-arthur.mathieu@hpe.com>
meta:release:Code-Review+1: Graham Hayes <graham.hayes@hpe.com>
meta:release:Code-Review+1: Feilong Wang <flwang@catalyst.net.nz>
meta:release:Code-Review+1: Rabi Mishra <ramishra@redhat.com>
meta:release:Code-Review+2: Davanum Srinivas (dims) <davanum@gmail.com>
meta:release:Code-Review+1: Telles Mota Vidal Nóbrega <tenobreg@redhat.com>
meta:release:Code-Review+1: Rico Lin <rico.lin.guanyu@gmail.com>
meta:release:Code-Review+1: Eric K <ekcs.openstack@gmail.com>
meta:release:Code-Review+1: amrith <amrith.kumar@gmail.com>
meta:release:Code-Review+1: Ian Cordasco <sigmavirus24@gmail.com>
meta:release:Code-Review+1: Vitaly Gridnev <vgridnev@mirantis.com>
meta:release:Code-Review+1: Steve McLellan <steven.j.mclellan@gmail.com>
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>
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