Fix two shadowed declaration warnings on FreeBSD-based platform:
'reboot' is a 4.0BSD syscall in unistd.h and 'tcp_seq' is a typedef in
netinet/tcp.h.
(This used to be commit 14d2a4da1da38d6f69c63505d35990322f253e5d)

Truncate sendto(), recvfrom(), send() and recv() to 1500 bytes
so that're getting a correctly formatted pcap file and the result
look more like real network traffic.

metze
(cherry picked from commit 5b01206f1bb2e62c08bda34b45904ec4f83ac5de)
(This used to be commit eb8c37a1ca97b41de00ec937a90bfdbe9cd21531)

metze
(This used to be commit b03c2793548834a1dc0483b03081d872ab1e17f0)

(cherry picked from commit 2548c2a1e7dab8abc00f8f49374a08cc0b427552)
(This used to be commit e4e015caac88f6e31ca6d8fcda5a97a11aee226d)

metze
(cherry picked from commit 47f865165e772540334dcbcf80cfc1999b0132fa)
(This used to be commit 4d5bfcc731b44267e2c30fccdca72b6058b16bfb)

metze
(cherry picked from commit 96f1a0dfaa18a432fca4b5432d929d8daed0abb1)
(This used to be commit 801ed0b79956133f2baa6b2db4a7dd5a68060edc)

To make this pass, I needed to add support for 6 and 17 as valid
protocol values to socket().

Andrew Bartlett
(partly cherry picked from commit 2254e61a1e5b29a64c5a24aac029ace193057e24)

metze
(This used to be commit 66b9f6f3722defd0863b055916b302478715704b)

(cherry picked from commit d2baa8218cf504d6631d610f9fd393ad8c61574c)
(This used to be commit cf6d815ba82a25c1e1f1dfdb8548cc588d44d1aa)

(partly cherry picked from commit 872e2ad541478597191ca9e31872d5c8e2bbb832)

metze
(This used to be commit 8003f00a28bb7237ec1b1f4eb9687c542a86c2b2)