Since the master branch no longer supports Python 2, and many distros
still default /usr/bin/python to Python 2, this commit changes the
scripts to explicitly call Python 3.
Woot!
The conflicts below are intentional because they contained salt-api-isms
that needed to be included into the corresponding Salt files.
Conflicts:
debian/changelog
debian/control
doc/conf.py
doc/index.rst
opt_requirements.txt
salt/config.py
salt/loader.py