isic: Add new package

This adds the ISIC is a suite of utilities to exercise the stability of an IP and its component stacks (TCP/UDP/ICMP etc.) It generates piles of pseudo random packets with configurable tendancies, then sent to the target to penetrate its firewall rules or find bug

backported two patches from Redhat.

Signed-off-by: Armin Kuster <akuster808@gmail.com>