Log which address and port the UDP listener is configured for. This will match that given for InternalAddress in the config (e.g. 0.0.0.0)

Can't obtain actually bound address until the UDP socket is used for the first time.

OpenSim/Region/ClientStack/LindenUDP/OpenSimUDPBase.cs

@@ -101,6 +101,10 @@ namespace OpenMetaverse
 
                 IPEndPoint ipep = new IPEndPoint(m_localBindAddress, m_udpPort);
                 
+                m_log.DebugFormat(
+                    "[UDPBASE]: Binding UDP listener using internal IP address config {0}:{1}", 
+                    ipep.Address, ipep.Port);                
+
                 m_udpSocket = new Socket(
                     AddressFamily.InterNetwork,
                     SocketType.Dgram,