heat 6.1.2 release

meta:version: 6.1.2
meta:diff-start: -
meta:series: mitaka
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: ricolin <rico.lin@easystack.cn>
meta:release:Commit: Rico Lin <rico.lin.guanyu@gmail.com>
meta:release:Change-Id: I3367e6218f31c1422d8a97f527450d0f3fe0749d
meta:release:Code-Review+2: Alan Pevec <alan.pevec@redhat.com>
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>
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