horizon 19.2.0 release

meta:version: 19.2.0
meta:diff-start: -
meta:series: wallaby
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: Akihiro Motoki <amotoki@gmail.com>
meta:release:Commit: Akihiro Motoki <amotoki@gmail.com>
meta:release:Change-Id: Ic1179b0f4173fc05b7e4f3238d4aa6c88d9df5df
meta:release:Code-Review+1: Vishal Manchanda <manchandavishal143@gmail.com>
meta:release:Code-Review+2: Hervé Beraud <herveberaud.pro@gmail.com>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>