python-openstackclient 3.15.0 release

meta:version: 3.15.0
meta:diff-start: -
meta:series: rocky
meta:release-type: release
meta:pypi: yes
meta:first: yes
meta:release:Author: Dean Troyer <dtroyer@gmail.com>
meta:release:Commit: Dean Troyer <dtroyer@gmail.com>
meta:release:Change-Id: Ie2c40057a494e638229670d1c5856702cc5c5a9a
meta:release:Code-Review+1: Emilien Macchi <emilien@redhat.com>
meta:release:Code-Review+1: Bogdan Dobrelya <bdobreli@redhat.com>
meta:release:Code-Review+1: Harald Jensås <hjensas@redhat.com>
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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