Fix the loop unrolling inside resolve_ads(). If we don't get an IP list don't use...

Fix the loop unrolling inside resolve_ads(). If we don't get an IP list don't use interpret_string_addr(), as this only returns one address, use interpret_string_addr_internal() instead.

Autobuild-User: Jeremy Allison <jra@samba.org>
Autobuild-Date: Mon Apr 30 23:21:16 CEST 2012 on sn-devel-104
(cherry picked from commit 1270cfb45ffa0bbcacf7254b5b45f492a8dcde77)

The last 4 patches address bug #8910 (resolve_ads() code can return zero
addresses and miss valid DC IP addresses).