oslo.concurrency 3.18.0 release

meta:version: 3.18.0
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: I738d607d8923c3b5bf9ed62b5e381b2d4e09ba00
meta:release:Code-Review+1: Joshua Harlow <jxharlow@godaddy.com>
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>
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