cliff 2.16.0 release

meta:version: 2.16.0
meta:diff-start: -
meta:series: train
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Commit: Dean Troyer <dtroyer@gmail.com>
meta:release:Change-Id: I08f7278d93e44263984939a8872d1970c89c9b67
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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