cliff 2.10.0 release

meta:version: 2.10.0
meta:diff-start: -
meta:series: queens
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Akihiro Motoki <amotoki@gmail.com>
meta:release:Commit: Akihiro Motoki <amotoki@gmail.com>
meta:release:Change-Id: Ie2871d92cc91e372bb13750e397d49e9a293d334
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Code-Review+1: melissaml <ma.lei@99cloud.net>
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>
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