22689ba524
In change Iafeb88eaf9a596603ad4d2134a4574345d5189ab we fixed a bug with handling of `tox --showconfig -vv` in the siblings tasks for the tox role. This arose because of the desire to add tox_extra_args to all tox invocations in Ibfe77f67e43135ae5af7588d6859b8b3dbd4c3ca because we currently set a default of '-vv' for the tox_extra_args rolevar. This fix could easily regress in the future if we were to ever change the default value, so explicitly test with it in the zuul-jobs-test-tox job by adding it to the python/tox test playbook. Change-Id: Ib6ddf7d188904193a5ecd520acac1d676e5d78ae