keystonemiddleware 4.15.0 release

meta:version: 4.15.0
meta:diff-start: -
meta:series: pike
meta:release-type: release
meta:pypi: yes
meta:first: yes
meta:release:Author: Thomas Bechtold <tbechtold@suse.com>
meta:release:Commit: Thomas Bechtold <tbechtold@suse.com>
meta:release:Change-Id: I9d2f49bbc68024c5e1eaaca98a4b934ee324cfb4
meta:release:Code-Review+1: Anthony Washington <anthony.washington@intel.com>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>
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