horizon 9.1.1 release

meta:version: 9.1.1
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: I4ba36a1a556e25b51da741eeb2d3fd6f29e392d8
meta:release:Code-Review+2: Tony Breeds <tony@bakeyournoodle.com>
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>
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