add documentation to forwarding script.
add documentation to forwarding script.

illinoistech-itm/pykkon,Illinois-tech-ITM/BSMP-2016-ISCSI-Packet-Injection,illinoistech-itm/pykkon,Illinois-tech-ITM/BSMP-2016-ISCSI-Packet-Injection,illinoistech-itm/pykkon,Illinois-tech-ITM/BSMP-2016-ISCSI-Packet-Injection