swift 2.8.0 release

meta:version: 2.8.0
meta:series: newton
meta:release-type: release
meta:announce: openstack-announce@lists.openstack.org
meta:pypi: no
meta:first: yes
meta:release:Author: John Dickinson <me@not.mn>
meta:release:Commit: John Dickinson <me@not.mn>
meta:release:Change-Id: I36324893da3f3d436e41f336e8450edfece9e691
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>
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