put the multiple routing tables support back in, fixed.

problem before: with this, we are no longer using the address family as
array index directly, since only 3 of 31 address fanilies actually attach
a table, but we're using an address family to array index translation (just
another array). there, 0 meant "does not attach a table", thus rt_gettable
has to return a null pointer. unfortunately we were using array index 0 for
whatever af attaches first, and since the list is backwards,, that used to
be ipsec - execpt on ipsec-less ramdisks, where it was inet6, and since
route show blindly iterates over all address families, and all those
without a table pointed to index 0, we got 28 or 29 copies of the v6 table.
i had that right initally, and then i borked it later... re-spotted by
claudio.
ok norby hshoexer claudio

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