horizon 12.0.0.0rc3 release candidate

meta:version: 12.0.0.0rc3
meta:diff-start: -
meta:series: pike
meta:release-type: release candidate
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: I10f4becf1422e2119db734fbd18d00d2670db5fe
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Sean McGinnis <sean.mcginnis@gmail.com>
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