s4-rpc: dnsserver: Fix enumeration of IPv4 and IPv6 addresses

s4-rpc: dnsserver: Fix enumeration of IPv4 and IPv6 addresses

In the initial implementation only IPv4 addresses were supported.

Add IPv6 (and mixed IPv4/IPv6) support and all further needed conversion
routines to support w2k, dotnet, longhorn clients.

Signed-off-by: Guenter Kukkukk <linux@kukkukk.com>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
Autobuild-User(master): Amitay Isaacs <amitay@samba.org>
Autobuild-Date(master): Wed Nov 26 03:44:07 CET 2014 on sn-devel-104

(cherry picked from commit 3ac4355f3e7f79bc0045c43bc818697dc6b08850)

The last 3 patches address
BUG: https://bugzilla.samba.org/show_bug.cgi?id=10952
samba-tool dns serverinfo <server> is broken for IPv6 - also in mixed IPv4/IPv6
environments.