Initial support for FreeBSD platform:
- tcphdr and udphdr structures have been replaced with FreeBSD compatible
  equivalent
- minor fixes

Change-Id: I578acca05f62b36396c97d2296545e0d412280df
Authors: Grzegorz Bernacki, Michał Dubiel, Dominik Ermel
Merge "Initial support for FreeBSD platform: - tcphdr and udphdr structures have been replaced with FreeBSD compatible   equivalent - minor fixes"