pbr 4.0.4 release

meta:version: 4.0.4
meta:diff-start: -
meta:series: independent
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Ben Nemec <bnemec@redhat.com>
meta:release:Commit: Ben Nemec <bnemec@redhat.com>
meta:release:Change-Id: Ibcc81b8cfe820101a5142c710efd495827bb1221
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
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