cliff 2.8.0 release

meta:version: 2.8.0
meta:diff-start: -
meta:series: pike
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Dean Troyer <dtroyer@gmail.com>
meta:release:Commit: Dean Troyer <dtroyer@gmail.com>
meta:release:Change-Id: I2ed9545d52ec1fa54e01d659dc0184220ebb1fd0
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>
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