Currently, only internal encryption and decryption were tested but the
implementation might not be the on it is supposed to be.

Add reference packets generated using Ubuntu-16.04, iproute2 and ping:
 # ip -V
 ip utility, iproute2-ss151103
 # uname -a
 Linux router-vm 4.4.0-62-generic #83-Ubuntu SMP Wed Jan 18 14:10:15 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
 # ping -V
 ping utility, iputils-s20160308

Signed-off-by: Thomas Faivre <thomas.faivre@6wind.com>