oslo.utils 3.21.0 release

meta:version: 3.21.0
meta:diff-start: -
meta:series: ocata
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Joshua Harlow <jxharlow@godaddy.com>
meta:release:Commit: Joshua Harlow <jxharlow@godaddy.com>
meta:release:Change-Id: I7e855f8b4a4b28e6d206e3c9065f013d60bc4df0
meta:release:Code-Review+2: Tony Breeds <tony@bakeyournoodle.com>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>
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