oslo.config 3.20.0 release

meta:version: 3.20.0
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: Ic7c5f479cadb40da83d4343eb422ffb1156797b5
meta:release:Code-Review+1: Sergey Nikitin <snikitin@mirantis.com>
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>
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