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: I4433ce26a4a8adbe5307b9dd1afb2af8f496630d
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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: I4433ce26a4a8adbe5307b9dd1afb2af8f496630d