Setuptools v54.1.0 introduces a warning that the use of dash-separated
options in 'setup.cfg' will not be supported in a future version [1].
Get ahead of the issue by replacing the dashes with underscores. Without
this, we see 'UserWarning' messages like the following on new enough
versions of setuptools:
UserWarning: Usage of dash-separated 'description-file' will not be
supported in future versions. Please use the underscore name
'description_file' instead
Change-Id: I4f21b16ae3518b11b49e3c190b609c44c1e753d4
a few cleanups:
- Remove obsolete sections from setup.cfg
- Switch to using sphinx-build
- Remove install_command from tox.ini, the default is fine
- Update pbr requirements
- Fix problems, mainly "Could not lex literal block"
- Use py38 job for Victoria cycle
Change-Id: Id706786bed4b20682704d524986850b7c71e225d