Add a flag to the usage display.
Add a flag to the usage display.

  There was a missing description for a new flags to netstat.
  I already added the fix to netstat man, but usage() change is
  also necessary.

Specified by: Ben Smithurst <ben@scientia.demon.co.uk>
Approved by: jkh

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase