horizon 9.1.2 release

meta:version: 9.1.2
meta:diff-start: -
meta:series: mitaka
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: Rob Cresswell <robert.cresswell@outlook.com>
meta:release:Commit: Rob Cresswell <robert.cresswell@outlook.com>
meta:release:Change-Id: Iae514c6c6402645e31c05cf310090e1dab946799
meta:release:Code-Review+2: Tony Breeds <tony@bakeyournoodle.com>
meta:release:Code-Review+2: Alan Pevec <alan.pevec@redhat.com>
meta:release:Workflow+1: Alan Pevec <alan.pevec@redhat.com>