cliff 2.18.0 release

meta:version: 2.18.0
meta:diff-start: -
meta:series: ussuri
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Stephen Finucane <sfinucan@redhat.com>
meta:release:Commit: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Change-Id: I291eb02489d7587cd0a8dd9145dd3cf6c667015f
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Workflow+1: Sean McGinnis <sean.mcginnis@gmail.com>
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