Use py3 as the default runtime for tox
Moving on py3 as the default runtime for tox to avoid to update this at each new cycle. Wallaby support officially the following runtimes [1]: - Python 3.6 - Python 3.8 During Victoria Python 3.7 was used as the default runtime [2] however this version isn't longer officially supported. [1] https://governance.openstack.org/tc/reference/runtimes/wallaby.html#python-runtimes-for-wallaby [2] https://governance.openstack.org/tc/reference/runtimes/victoria.html#python-runtimes-for-victoria Change-Id: Ic65d88fa105a2345ce8dbc3973e634446ecbee4b
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