oslo.middleware 3.12.0 release

meta:version: 3.12.0
meta:series: newton
meta:release-type: release
meta:announce: openstack-dev@lists.openstack.org
meta:pypi: yes
meta:first: no
meta:release:Author: Joshua Harlow <jxharlow@godaddy.com>
meta:release:Commit: Davanum Srinivas <davanum@gmail.com>
meta:release:Change-Id: Ia9f8ba9188e546c9e107958dde2908415531b50c
meta:release:+    * Add policy registration and authorize method
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