nova 12.0.6 release

meta:version: 12.0.6
meta:diff-start: -
meta:series: liberty
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: Matt Riedemann <mriedem@us.ibm.com>
meta:release:Commit: Matt Riedemann <mriedem@us.ibm.com>
meta:release:Change-Id: If78492e796036427a01ce81d09d451a62fa26e77
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Code-Review+1: Davanum Srinivas (dims) <davanum@gmail.com>
meta:release:Code-Review+1: Alan Pevec <alan.pevec@redhat.com>
meta:release:Code-Review+2: Tony Breeds <tony@bakeyournoodle.com>
meta:release:Workflow+1: Tony Breeds <tony@bakeyournoodle.com>
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