oslo.concurrency 3.18.1 release

meta:version: 3.18.1
meta:diff-start: -
meta:series: ocata
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: ChangBo Guo(gcb) <eric.guo@easystack.cn>
meta:release:Commit: ChangBo Guo(gcb) <eric.guo@easystack.cn>
meta:release:Change-Id: I6a92134c961e8169da8a7a1d45d2dc21164bc595
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Code-Review+2: Tony Breeds <tony@bakeyournoodle.com>
meta:release:Workflow+1: Tony Breeds <tony@bakeyournoodle.com>
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