heat 12.2.0 release

meta:version: 12.2.0
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: ricolin <rico.lin.guanyu@gmail.com>
meta:release:Change-Id: I2c170cf3e75c18a803931c2da24f8775bfec57ca
meta:release:Code-Review+2: Hervé Beraud <hberaud@redhat.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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