netty reduce unneccessary threads #47 (#52)

Author: j-qayyum

core/jdiameter/impl/src/main/java/org/jdiameter/client/impl/transport/tcp/netty/TCPTransportClient.java

@@ -45,7 +45,7 @@
  */
 public class TCPTransportClient {
   protected EventLoopGroup workerGroup;
-  protected EventExecutorGroup eventExecutorGroup = new DefaultEventExecutorGroup(4);
+  protected EventExecutorGroup eventExecutorGroup = new DefaultEventExecutorGroup(1);
   protected Channel channel;
   protected TCPClientConnection parentConnection;
   protected InetSocketAddress destAddress;