https://github.com/google/packetdrill/commit/77ab15806a56de226345fbe1910139829e431fe0

The names of the constants were wrong and the code wasn't dealing
with the case that none of the constants are defined, like in
the case on PowerPC for FreeBSD.

MacOS uses a different name for the TCP_INFO socket option.

Use the IANA assigned option number for the TCP Fast Open option.
Use EXP-FO instead of TO for using the deprecate experimental option.

Sponsored by:	Netflix

Initial commit for the packetdrill network stack testing tool:

  https://code.google.com/p/packetdrill/



Signed-off-by: Neal Cardwell <ncardwell@google.com>