* 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.
* Replace .testr.conf by .stestr.conf for migration and update
.gitignore and test-requirements.txt file accordingly
* Use py3 as the default runtime for tox
* Add a new job, openstack-cover-jobs, to run the coverage in Zuul
[1] https://github.com/pypa/setuptools/commit/a2e9ae4cb
Change-Id: I3169456592324425b9a9ddc4dbcf8abcf3b82135
In preparation for python 3 support switch to newer sphinx version.
This requires openstackdocstheme.
Remove install_command, this is the default.
Update hacking version to be compatible with python 3, fix warnings
from new pep8.
Change-Id: Iab69ec59eb111571f784242c5ea5756c2a63e424