oslo.concurrency 3.30.1 release

meta:version: 3.30.1
meta:diff-start: -
meta:series: train
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Daniel Bengtsson <dbengt@redhat.com>
meta:release:Commit: Thierry Carrez <thierry@openstack.org>
meta:release:Change-Id: I89ccffa4b60772c5c86823b887f55a90fac66554
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: Thierry Carrez <thierry@openstack.org>