MFC 1.251:   When we drop packet due to no space in output interface output queue, also   increase the ifp->if_snd.ifq_drops.
MFC 1.251:
  When we drop packet due to no space in output interface output queue, also
  increase the ifp->if_snd.ifq_drops.

  PR:             72440
  Submitted by:   ikob

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