Added python-sphinx build dependency for Ubuntu 18.04 Python 2
Added python-sphinx build dependency for Ubuntu 18.04 Python 2

saltstack/salt-pack,saltstack/salt-pack,saltstack/salt-pack,dmurphy18/salt-pack,saltstack/salt-pack,saltstack/salt-pack,dmurphy18/salt-pack,dmurphy18/salt-pack,dmurphy18/salt-pack,dmurphy18/salt-pack