Add kippo SSH honeypot service.

There was quite a bit a NixOS specific things that had to be moved around. I tried to stay within the FHS guidlines.  Let me know if there's a standard way to do something that I missed. (or if there's a way to use buildPythonPackages)

This is fairly easy to run with just an enable=true; hostname="whatever.com"; and an iptables port redirect.