pbr 5.8.1 release

meta:version: 5.8.1
meta:diff-start: -
meta:series: independent
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Jeremy Stanley <fungi@yuggoth.org>
meta:release:Commit: Jeremy Stanley <fungi@yuggoth.org>
meta:release:Change-Id: I4a96f0cb79547b2d65abcb606472ea41b21c9ad6
meta:release:Code-Review+1: Elod Illes <elod.illes@est.tech>
meta:release:Code-Review+2: Hervé Beraud <herveberaud.pro@gmail.com>
meta:release:Workflow+1: Hervé Beraud <herveberaud.pro@gmail.com>
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