sort list on is_primary rather than interface_id. this is guaranteed to have
-rw-r--r-- 5675 modprobe.py
-rwxr-xr-x 14932 plnet.py
-rw-r--r-- 1635 pyplnet.spec
-rw-r--r-- 1546 setup.py
-rw-r--r-- 2062 sioc.py