Anand Bhat 55a24e730d Replace dashes with underscore & Migrate to stestr
* 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
2021-06-02 16:20:58 +05:30

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