heat 12.0.0.0rc1 release candidate

meta:version: 12.0.0.0rc1
meta:diff-start: -
meta:series: stein
meta:release-type: release candidate
meta:pypi: no
meta:first: no
meta:release:Author: Kendall Nelson <kennelson11@gmail.com>
meta:release:Commit: ricolin <rico.lin.guanyu@gmail.com>
meta:release:Change-Id: Id2203a7cbe9eef0569ded4a3286746ef2c98e77e
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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