designate 6.0.0.0rc1 release candidate

meta:version: 6.0.0.0rc1
meta:diff-start: -
meta:series: queens
meta:release-type: release candidate
meta:pypi: no
meta:first: no
meta:release:Author: Graham Hayes <gr@ham.ie>
meta:release:Commit: Graham Hayes <gr@ham.ie>
meta:release:Change-Id: I485ab3c6bb7f4560f9b9e68e3778858aa7d51f38
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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