nos-tun(8) on FreeBSD

The text 68c3b8898297, as FreeBSD 5.2.1-RELEASE, FreeBSD 5.2-RELEASE, FreeBSD 5.1-RELEASE, FreeBSD 5.0-RELEASE shipped it.

implement ``nos'' or ``ka9q'' style IP over IP tunnel

nos-tun(8) on FreeBSD now