OpenFlow 1.0: Decode ports the same way as in 1.3.

OpenFlow 1.0: Decode ports the same way as in 1.3.

The port printing function used to have a loop and a size check, even
though OFPT_PORT_STATUS always has exactly one port. Make it a function
that prints exactly one physical port structure in a linear way and place
the loop and the size check in of10_features_reply_print(), where they
really belong.