python-troveclient 2.15.0 release

meta:version: 2.15.0
meta:diff-start: -
meta:series: rocky
meta:release-type: release
meta:pypi: yes
meta:first: yes
meta:release:Author: Zhao Chao <zhaochao1984@gmail.com>
meta:release:Commit: Zhao Chao <zhaochao1984@gmail.com>
meta:release:Change-Id: I442218835f6d1d4550f4d1552e74cae71bf10adc
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>
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