[patch] tun(4) and tap(4) if_clone support.

[Bruce M. Simpson]

Hi,

I have cleaned up the style/mdoc bugs in the original patch, and cut a 
new one against bleeding edge HEAD (we just took the kern_conf.c fix in 
too):-

   http://people.freebsd.org/~bms/dump/new-landon-tuntap.diff

PRs potentially resolved by this patch:
http://www.freebsd.org/cgi/query-pr.cgi?pr=conf/90413
http://www.freebsd.org/cgi/query-pr.cgi?pr=conf/105570

Regards,
BMS