Code generate tox-travis.ini

[texasaggie97-zz]

Once #1190 is merged, we should code generate tox-travis.ini from tox.ini since they are very similar.

[marcoskirsch]

We should be able to generate the files wholesale so we don’t need to repeat the same things for each supported driver.

[ni-jfitzger]

Will be Obsoleted by #2201