Update docker build process

src/main/java/netneutrality/http/server/ActionHandler.java

@@ -25,8 +25,8 @@ public class ActionHandler extends AbstractHandler {
 
         if (path.equals("/actions/shutdown")) {
             LoggerFactory.getLogger(NetNeutrality.class).info("Request to shutdown received");
-            sendStringResponse(exchange, "Shutting down..");
             NetNeutrality.shutdown();
+            sendStringResponse(exchange, "Shutting down..");
 
             System.exit(0);
             return;