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: Ie53918780ea7e5e83cb704661f8c2475b9f7d7aa Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>
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