Clean up the way we handle vnodes and unroutable IP addresses - there
isn't really a good reason for keeping them seperate. All we really care about is putting the unroutable addresses in one file and the routable ones in another. So, instead of generating three forward zone files, we only have to generate two. They are not as pretty as the ones named_setup used to generate, but the code to make them is much, much cleaner and more comprehensible. Also makes named_setup about twice as fast - 2s vs 4s. Still too slow, but better!
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