tox: Allow to run Python tests in parallel on demand

Enable to speedup tests execution by using the following command:

$ tox -- -n auto

Could also be added in https://gitlab.softwareheritage.org/swh/devel/swh-py-template

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mentioned in merge request swh-web!1193 (merged)

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To modify by simply ensuring pytest-xdist is installed in the tox venv. Parallel tests should be executed on demand by user using tox -- -n auto.

Rationale: having -n auto by default would make it hard to control the load on Jenkins in case multiple tests are started.

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