*TEST* send udp sync. Stop uncontroled and hidden use of IO threads.

Testing this may require several people.

OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs

@@ -1305,7 +1305,8 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             PacketsSentCount++;
 
             // Put the UDP payload on the wire
-            AsyncBeginSend(buffer);
+            //AsyncBeginSend(buffer);
+            SyncSend(buffer);
 
             // Keep track of when this packet was sent out (right now)
             outgoingPacket.TickCount = Environment.TickCount & Int32.MaxValue;