Remove pytest-related dependencies from setup.py

The `setup_requires` line prevents builds in internal environments
without Internet access / pythonX-pytest-runner RPM installed.

In fact, we're running tests with `pytest`, outside of `setup.py`, so we
don't need those dependencies there.

Note: we decided not to run tests through `python setup.py pytest`
because pytest-runner was limited in how we can pass arguments to pytest
/ enable plugins. E.g., I could not get the coverage plugin working when
running `python setup.py pytest`.

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