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

[Landon Fuller]

Nick Barkas (snb at threerings.net) and I have added interface cloning  
support to the tun(4) and tap(4) drivers.

We maintained backwards-compatible support for devfs cloning, which  
is now disabled by default -- it can be re-enabled via a sysctl.  
Interfaces that are created via devfs cloning may still be removed  
via ifconfig destroy.

The latest patch is available here
	http://www.opendarwin.org/~landonf/code/patch-tuntap_ifclone

I've submitted kern/105228 with the patch, and I'd be most  
appreciative of comments/suggestions.

Thanks,
Landon Fuller
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