Summary of changes:
- integration of Cisco work on nFAPI.
  See commits 7757b9e7
  and 922b5b59 for details.
- support Ubuntu 17.04 and 17.10
- bugfix: DCI padding bits
  This bug made the system non-working because the DCIs for
  SIBs were wrong. See commit c5ca2bd8
  for details.
- fix issue 281: IQ record/playback explicit filename segv.