nat and ipfw - divert or builtin

[Randy Bush]

> I believe the integrated version makes configuration simpler. I would
> choose the old classic divert with ipfw if it is for a important network
> that must work, but if I was running -current I would try the integrated
> variant beacuse it seems to be simpler to use.

and one less daemon.  less code is better code.

i will likely give it a try.  thanks.

randy