pbr 4.1.0 release

meta:version: 4.1.0
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: Iecb1f6ddb2689ff641202a894bdde61dcd56ebfe
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Code-Review+1: melissaml <ma.lei@99cloud.net>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>
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