cinder 15.4.1 release

meta:version: 15.4.1
meta:diff-start: -
meta:series: train
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: Rajat Dhasmana <rajatdhasmana@gmail.com>
meta:release:Commit: Rajat Dhasmana <rajatdhasmana@gmail.com>
meta:release:Change-Id: I90dbb1e9685e5c683650c3d67d5b415babc3fbf7
meta:release:Code-Review+1: Brian Rosmaita <rosmaita.fossdev@gmail.com>
meta:release:Code-Review+2: Hervé Beraud <hberaud@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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