pbr 5.2.1 release

meta:version: 5.2.1
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: Iba1df2119592ce5a468d56958019c08692b6b245
meta:release:Code-Review+2: Tony Breeds <tony@bakeyournoodle.com>
meta:release:Workflow+1: Tony Breeds <tony@bakeyournoodle.com>
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