Merge tag '4.3.1' into debian/victoria

oslo.concurrency 4.3.1 release

meta:version: 4.3.1
meta:diff-start: -
meta:series: victoria
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Daniel Bengtsson <dbengt@redhat.com>
meta:release:Commit: Daniel Bengtsson <dbengt@redhat.com>
meta:release:Change-Id: I3d5c504ec9402be846c12aae3832d1aa580292cf
meta:release:Code-Review+2: Hervé Beraud <hberaud@redhat.com>
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Workflow+1: Sean McGinnis <sean.mcginnis@gmail.com>