heat 12.1.0 release

meta:version: 12.1.0
meta:diff-start: -
meta:series: stein
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: ricolin <rico.lin.guanyu@gmail.com>
meta:release:Commit: Thierry Carrez <thierry@openstack.org>
meta:release:Change-Id: I6be6104516ca0a1fb1009852e0994c79b114d63b
meta:release:Code-Review+2: Hervé Beraud <hberaud@redhat.com>
meta:release:Code-Review+1: Rico Lin <rico.lin.guanyu@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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