ceilometer 6.1.5 release

meta:version: 6.1.5
meta:diff-start: -
meta:series: mitaka
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: Hanxi_Liu <hanxi.liu@easystack.cn>
meta:release:Commit: Hanxi_Liu <hanxi.liu@easystack.cn>
meta:release:Change-Id: I88d8ab4eb7d09e1442a6c5af89100ec463182a67
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>
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