keystonemiddleware 4.12.0 release

meta:version: 4.12.0
meta:diff-start: -
meta:series: ocata
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Lance Bragstad <lbragstad@gmail.com>
meta:release:Commit: Lance Bragstad <lbragstad@gmail.com>
meta:release:Change-Id: I41a4abc1d7cae135741dfd9cda68225797a72a8b
meta:release:Code-Review+1: Steve Martinelli <s.martinelli@gmail.com>
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>
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