Whitespace fixes
Assign unique MAC address for each Interface VM.

- PortRegister now has a "hwaddress" field used to inform rfserver of
  the address for each port.
- RFClient no longer sets the hwaddress of each interface to the same
  MAC.
- RFTable.RFEntry now stores an eth_addr
- RFServer register_vm_port now adds a hwaddress received from rfclient.
- Register route mod sends a route mod for each port matching the
  in_port and hwaddress.
- We no longer match on incoming MAC address, as this is unviable on
  OF1.0. A later implementation should have RFClient share all available
  MAC addresses with RFServer independently of routes.
rfproxy: Support RFMT_IN_PORT

Signed-off-by: Joe Stringer <joestringernz@gmail.com>