designate 3.0.0.0rc2 release candidate

meta:version: 3.0.0.0rc2
meta:diff-start: -
meta:series: newton
meta:release-type: release candidate
meta:announce: openstack-announce@lists.openstack.org
meta:pypi: no
meta:first: no
meta:release:Author: Graham Hayes <graham.hayes@hpe.com>
meta:release:Commit: Graham Hayes <graham.hayes@hpe.com>
meta:release:Change-Id: If585015f82af2033009fb955e2c6594d8807caf8
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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