tox: Drop basepython
Python 2 reached its EOL long time ago and we no longer expect any user may attempt to run tox in Python 2. Removing the option allows us to remove ignore_basepython_conflict. Change-Id: Ibff3444cb38c60d5281daddfd252ac490e4ad838 Co-authored-by: Takashi Kajinami <kajinamit@oss.nttdata.com> Signed-off-by: Ivan Anfimov <lazekteam@gmail.com>
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