2f687e3373
Put these in place as a setup for the new versions of the doc build jobs. Keep using them from the normal dep list until the jobs are changed. While we're here, update the docs env to use sphinx-build instead of python setup.py build_sphinx. Also add python2.7 to the docs env, since I accidentally tried building it with my python3 tox and it blew up substantially. Change-Id: I0fcc50c4c396758e839c329ce786a6f609bb1342