neutron 15.3.1 release

meta:version: 15.3.1
meta:diff-start: -
meta:series: train
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: Bernard Cafarelli <bcafarel@redhat.com>
meta:release:Commit: Bernard Cafarelli <bcafarel@redhat.com>
meta:release:Change-Id: I10f4e1e24486d59217a6a21d11f003c1ace73c37
meta:release:Code-Review+2: Hervé Beraud <hberaud@redhat.com>
meta:release:Code-Review+1: Slawek Kaplonski <skaplons@redhat.com>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>
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