Update tox.ini.
Update tox.ini.

The contents of tox.ini were out of date. Update them in preparation
for Jenkins check and gate tests.

Change-Id: I7b6e33b118e0bdab492560c8e36d50c5f7c2c10b

JioCloud/oslo-incubator,JioCloud/oslo-incubator,JioCloud/oslo-incubator