TCP fast open support

[Daniel Lee <longinus00 () gmail com>]

I added support for the experimental TCP fast open option in tcpdump.
https://tools.ietf.org/html/draft-ietf-tcpm-fastopen-03

I my patch was inspired by the wireshark implementation.
https://anonsvn.wireshark.org/viewvc/trunk/epan/dissectors/packet-tcp.c?r1=46723&r2=46722&pathrev=46723

I also had to fix tcpdump's handling of syn packets with with a non zero 
data length.

I would appreciate any comments,especially regarding the formatting of 
the output, and am interested in knowing if you think this is worth pulling.
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