Add tox artifacts to .gitignore
Add tox artifacts to .gitignore

 * A tox build creates quantum/versioninfo and setuptools-*.egg,
   and git formerly marked them as untracked rather than ignored.

Change-Id: I50556717a05b2488cff5d9693d46637df608da70

yamt/networking-ofagent,budnyjj/ofagent,budnyjj/ofagent,yamt/networking-ofagent-old3