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: I10ea72cf70293034051b26608d52f43e46201b1d Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>
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