Setting tag sfa-4.0-2

Setting tag sfa-4.0-2
have shebangs mention python2 since it is what this version runs on
use rpm names in python2-something for expressing dependencies
remove build dependency to python-setuptools
Handle C-BAS hrn format with "\" (Loic)
sfa-start does not daemonize anymore (this is handled by systemd)
a little nicer logs when troubleshooting auth issues
use systemctl in Makefile when syncing