Fixed token not getting saved into tokenStore for QoS0 publishes, which fixes publish() hanging when the connection fails.

Signed-off-by: Liu Woon Yung <pirorin187@gmail.com>

Author: sp193

org.eclipse.paho.client.mqttv3/src/main/java/org/eclipse/paho/client/mqttv3/internal/ClientState.java

@@ -542,6 +542,9 @@ public void send(MqttWireMessage message, MqttToken token) throws MqttException
 						persistence.put(getSendPersistenceKey(message), (MqttPublish) message);
 						tokenStore.saveToken(token, message);
 						break;
+					case 0:
+						tokenStore.saveToken(token, message);
+						break;
 				}
 				pendingMessages.addElement(message);
 				queueLock.notifyAll();