* Fixes [irritating] edge case in Util.GetLocalHost which could return an IPv6 address if no non-loopback IPv4 address can be found.

* Restores internal IPv6 support to NetworkUtil.*
* Fixes bad login unit tests.

OpenSim/Framework/Util.cs

@@ -546,7 +546,15 @@ namespace OpenSim.Framework
             }
 
             if (hosts.Length > 0)
+            {
+                foreach (IPAddress host in hosts)
+                {
+                    if(host.AddressFamily == AddressFamily.InterNetwork)
+                        return host;
+                }
+                // Well all else failed...
                 return hosts[0];
+            }
 
             return null;
         }