nova 13.1.0 release

meta:version: 13.1.0
meta:series: mitaka
meta:release-type: release
meta:announce: openstack-announce@lists.openstack.org
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: I2e9d4b71593a8d96339074590974a79634c37710
meta:release:Code-Review+1: Tony Breeds <tony@bakeyournoodle.com>
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>
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