Log Message:
py-pbr: update to 5.8.0.

5.8.0
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* Add python2 testing back to PBR
* Allow PEP517 without setup_requires
* Clarify the need for setup.py with PEP517

5.7.0
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* Add a PEP517 interface
* PBR package testing improvements
* Run python3.9 test jobs
* Retire django-openstack-auth
* Correct comment for 'D1_D2_SETUP_ARGS'

5.6.0
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* Reverse ordering of 'D1_D2_SETUP_ARGS'
* Add test for cfg -> py transformation
* Don't pass empty 'long_description'
* Move flake8 as a pre-commit local target
* Map requires-python to python-requires (attempt 2)
* Update dependencies to avoid failure with old pip
* Increase OS_TEST_TIMEOUT to 1200
* Prevent test failure due to use of setpref
* util: Convert 'D1_D2_SETUP_ARGS' to a list of tuples
* Revert "Map requires-python to python-requires"
* Dropping lower constraints testing
* Adding pre-commit

5.5.1
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* Run tempest-full for stable/train
* Remove use_2to3 backward compat for Setuptools
* More easy_install.ScriptWriter.get_header()

5.5.0
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* Remove bdist_wininst support
* Increase integration test timeout
* Add Release Notes to documentation
* Cleanup old legacy devstack-gate jobs
* Begin work to modernize pbr's integration testing
* Re-add ChangeLog
* Update some url to use opendev.org
* Support newer openstackdocstheme
* Use easy_install.ScriptWriter.get_header()
* Remove neutron-fwaas from the jobs' required project
* Update python requires packaging metadata for package
* trivial: Improve logging of run commands
* Map requires-python to python-requires
* Update hacking
* Add support for virtualenv 20.x