Rather than instantiating a UTF8 encoding everywhere when we want to supress the BOM, use a single Util.UTF8NoBomEncoding.

This class is thread-safe (as evidenced by the provision of the system-wide Encoding.UTF8 which does not suppress BOM on output).

OpenSim/Services/Connectors/Neighbour/NeighbourServicesConnector.cs

@@ -132,8 +132,7 @@ namespace OpenSim.Services.Connectors
             try
             {
                 strBuffer = OSDParser.SerializeJsonString(args);
-                UTF8Encoding str = new UTF8Encoding();
-                buffer = str.GetBytes(strBuffer);
+                buffer = Util.UTF8NoBomEncoding.GetBytes(strBuffer);
             }
             catch (Exception e)
             {