horizon 16.2.1 release

meta:version: 16.2.1
meta:diff-start: -
meta:series: train
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: Elod Illes <elod.illes@est.tech>
meta:release:Commit: Elod Illes <elod.illes@est.tech>
meta:release:Change-Id: Ia2c366658bdd79ec976f90d3fb79fb8362e225d1
meta:release:Code-Review+1: Vishal Manchanda <manchandavishal143@gmail.com>
meta:release:Code-Review+2: Hervé Beraud <hberaud@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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