Merging veita-issue-446

Signed-off-by: James Sutton <james.sutton@uk.ibm.com>

Author: jpwsutton

org.eclipse.paho.client.mqttv3/src/main/java/org/eclipse/paho/client/mqttv3/IMqttAsyncClient.java

@@ -116,7 +116,7 @@
  *   also be notified when a message has been delivered to the requested quality of service.</p>
  *
  */
-public interface IMqttAsyncClient {
+public interface IMqttAsyncClient extends AutoCloseable {
 	/**
 	 * Connects to an MQTT server using the default options.
 	 * <p>The default options are specified in {@link MqttConnectOptions} class.

org.eclipse.paho.client.mqttv3/src/main/java/org/eclipse/paho/client/mqttv3/IMqttClient.java

@@ -59,7 +59,7 @@
  * style. The blocking client provides compatibility with earlier versions
  * of the MQTT client.</p>
  */
-public interface IMqttClient { //extends IMqttAsyncClient {
+public interface IMqttClient extends AutoCloseable { //extends IMqttAsyncClient {
 	/**
 	 * Connects to an MQTT server using the default options.
 	 * <p>The default options are specified in {@link MqttConnectOptions} class.

org.eclipse.paho.client.mqttv3/src/main/java/org/eclipse/paho/client/mqttv3/MqttClientPersistence.java

@@ -32,7 +32,7 @@
  * It is up to the persistence interface to log any exceptions or error information 
  * which may be required when diagnosing a persistence failure.</p>
  */
-public interface MqttClientPersistence {
+public interface MqttClientPersistence extends AutoCloseable {
 	/**
 	 * Initialise the persistent store.
 	 * If a persistent store exists for this client ID then open it, otherwise