cliff 3.0.0 release

meta:version: 3.0.0
meta:diff-start: -
meta:series: ussuri
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Hervé Beraud <hberaud@redhat.com>
meta:release:Commit: Hervé Beraud <hberaud@redhat.com>
meta:release:Change-Id: I721f3f2533e339df8b536277278d10f6981b2aee
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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