tox: Remove basepython
tox uses the python version where tox is installed by default, and we no longer expect that the tests may run in env with python 2. Change-Id: I5a797984b2e90864151e40fa361d076024bf5937
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tox uses the python version where tox is installed by default, and we no longer expect that the tests may run in env with python 2. Change-Id: I5a797984b2e90864151e40fa361d076024bf5937