pbr 2.0.0 release

meta:version: 2.0.0
meta:diff-start: -
meta:series: independent
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Andreas Jaeger <aj@suse.com>
meta:release:Commit: Davanum Srinivas (dims) <davanum@gmail.com>
meta:release:Change-Id: Icf86a3d768ec4c0788c62c277a4dc83373332eb0
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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