horizon 13.0.0.0b1 development milestone

meta:version: 13.0.0.0b1
meta:diff-start: -
meta:series: queens
meta:release-type: development milestone
meta:pypi: no
meta:first: no
meta:release:Author: Ying Zuo <yinzuo@cisco.com>
meta:release:Commit: Doug Hellmann <doug@doughellmann.com>
meta:release:Change-Id: I8b1bd51dbe44cec965f6b46a30119119431c20a4
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Workflow+1: Sean McGinnis <sean.mcginnis@gmail.com>
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