ofp-print: Make port "config" and "state" output easier to read.

ofp-print: Make port "config" and "state" output easier to read.

This changes the output of "ovs-ofctl show" from printing ports like this:
     1(eth1): addr:50:54:00:00:00:02, config: 0x11, state:0x1
to this:
     1(eth1): addr:50:54:00:00:00:02
         config:     PORT_DOWN NO_FLOOD
         state:      LINK_DOWN
which seems much easier to read.

It also eliminates trailing white space from the output.

Reported-by: Ethan Jackson <ethan@nicira.com>