IPv6 support Everywhere it makes sense

Referencing DIRSERVER-1622 , whatever's done there should be expanded to enable IPv6 support wherever it makes sense at all. I don't know if bootp ipv6 makes any sense, but just about everything else has some ipv6 interaction, and should be updated to reflect that.

With the depletion of IPv4 address space impending, it may be a Blocker in the near future.