Add test for conntect disconnect use case

Signed-off-by: Ranjan-Dasgupta <Ranjan.Dasgupta@us.ibm.com>

Author: Ranjan-Dasgupta

org.eclipse.paho.client.mqttv3.test/src/test/java/org/eclipse/paho/client/mqttv3/test/SendReceiveAsyncTest.java

@@ -164,7 +164,7 @@ public void testConAndDiscon() throws Exception {
     LoggingUtilities.banner(log, cclass, methodName);
 
     IMqttAsyncClient client = null;
-    int max_loop_count = 500;
+    int max_loop_count = 100;
 
     try {
       String clientId = methodName;