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
[1] https://github.com/pypa/setuptools/commit/a2e9ae4cb
Change-Id: I8d827447959b303f76faa724a4cca187c2183c86
Make a few cleanups:
- Remove obsolete sections from setup.cfg
- Remove install_command from tox.ini, merge constraints
into dependencies
- Enable warnings for doc build, fix all warnings
Change-Id: I3814f1a89882d0d86b621425dc9ff08f5c6b5d41
ZhongShengping