Don't error when a port in dot3StatsTable is missing in ifTable.
 - A corner case on C3750X where IOS creates a hidden Vl3071 SVI for the management vrf.
 - FYI, it can be found lurking here: vtpInternalVlanTable:[1][3071] = mgmt-vlan-service-module
add LLDP column to the port neighbor info
 - also display the management addr of neighbor