neutron 15.1.0 release

meta:version: 15.1.0
meta:diff-start: -
meta:series: train
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: Slawek Kaplonski <skaplons@redhat.com>
meta:release:Commit: Slawek Kaplonski <skaplons@redhat.com>
meta:release:Change-Id: I859b67b0a1d1c60e24ec70ca0d924bb2c4a9736e
meta:release:Code-Review+1: Bernard Cafarelli <bcafarel@redhat.com>
meta:release:Code-Review+1: Brian Haley <haleyb.dev@gmail.com>
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Code-Review+2: Hervé Beraud <hberaud@redhat.com>
meta:release:Workflow+1: Hervé Beraud <hberaud@redhat.com>
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