horizon 12.0.0.0rc1 release candidate

meta:version: 12.0.0.0rc1
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: Doug Hellmann <doug@doughellmann.com>
meta:release:Change-Id: Icf8df9ba083b0a13ddbeb4be7de9003e3aad1bbe
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Code-Review+2: Davanum Srinivas (dims) <davanum@gmail.com>
meta:release:Workflow+1: Davanum Srinivas (dims) <davanum@gmail.com>
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