pbr 3.0.0 release

meta:version: 3.0.0
meta:diff-start: -
meta:series: independent
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Julien Danjou <julien@danjou.info>
meta:release:Commit: Julien Danjou <julien@danjou.info>
meta:release:Change-Id: Ica1ba6c8560d544944a03b11353a45f71d42cd0b
meta:release:Code-Review+1: gordon chung <gord@live.ca>
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>
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