swift 2.21.1 release

meta:version: 2.21.1
meta:diff-start: -
meta:series: stein
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: Tim Burke <tim.burke@gmail.com>
meta:release:Commit: Thierry Carrez <thierry@openstack.org>
meta:release:Change-Id: Ic6ec29b7f742573a7a74fc0600689ad36b606858
meta:release:Code-Review+1: Hervé Beraud <hberaud@redhat.com>
meta:release:Code-Review+1: Jean-Philippe Evrard <jean-philippe@evrard.me>
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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