horizon 19.0.0 release

meta:version: 19.0.0
meta:diff-start: -
meta:series: wallaby
meta:release-type: release
meta:pypi: no
meta:first: yes
meta:release:Author: Ivan Kolodyazhny <e0ne@e0ne.info>
meta:release:Commit: manchandavishal <manchandavishal143@gmail.com>
meta:release:Change-Id: Idcc02734f45b6a59e766d1762b296e4af13cee84
meta:release:Code-Review+1: Vishal Manchanda <manchandavishal143@gmail.com>
meta:release:Code-Review+1: Ivan Kolodyazhny <e0ne@e0ne.info>
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>