[MERGE] Support IPv6 in smart server

[Jelmer Vernooij]

This is an updated version of my smart server patch after Mark tested it
on Windows. AI_ADDRCONFIG isn't available there, so that's no longer
specified. I've also fixed a failing test wrt unknown host lookups.

Cheers,

Jelmer
-- 
Jelmer Vernooij <jelmer at samba.org> - http://samba.org/~jelmer/
Jabber: jelmer at jabber.fsfe.org
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