Add support of multiple ptp instances on the same port and vlans to the wr_mon.
After the change output looks like:
 wri6 : Link down  WR Master  NoLock      i5 : no-ptp
 wri7 : Link up    Non WR     NoLock      i6 : peer: 00:00:00:00:00:00 ptp state master(6)
                                          i8 : peer: 00:1b:c5:09:0c:b8 ptp state master(6) vlans: 4,7,65
 wri8 : Link down  WR Master  NoLock      i7 : no-ptp
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>