nova 15.1.1 release

meta:version: 15.1.1
meta:diff-start: -
meta:series: ocata
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: melanie witt <melwittt@gmail.com>
meta:release:Commit: melanie witt <melwittt@gmail.com>
meta:release:Change-Id: I78f48e50bb2680f305e1e2297b08aa00dd76ce63
meta:release:Code-Review+1: Matt Riedemann <mriedem.os@gmail.com>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>
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