Merge tag '3.9.1' into debian/xena

oslo.vmware 3.9.1 release

meta:version: 3.9.1
meta:diff-start: -
meta:series: xena
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Hervé Beraud <hberaud@redhat.com>
meta:release:Commit: Hervé Beraud <hberaud@redhat.com>
meta:release:Change-Id: Ie77fcd2d48d251b4fb8fae0ec449e0d603fb587f
meta:release:Code-Review+2: Hervé Beraud <herveberaud.pro@gmail.com>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>