swift 2.23.0 release

meta:version: 2.23.0
meta:diff-start: -
meta:series: train
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: Tim Burke <tim.burke@gmail.com>
meta:release:Commit: Tim Burke <tim.burke@gmail.com>
meta:release:Change-Id: I56c2bd6432c1998790735f49e9bad5d4c1d7442f
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Workflow+1: Sean McGinnis <sean.mcginnis@gmail.com>
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