修正connection.id，statement.id, resultSet.id生成不正确的问题

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@227 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/main/java/com/alibaba/druid/stat/JdbcTraceManager.java

@@ -111,7 +111,7 @@ public class JdbcTraceManager extends NotificationBroadcasterSupport implements
 
         @Override
         public void fireEvent(TraceEvent event) {
-            Notification notification = new Notification(event.getEventType(), null, sequenceNumber++);
+            Notification notification = new Notification(event.getEventType(), JdbcTraceManager.class.getName(), sequenceNumber++);
             notification.setTimeStamp(event.getEventTime().getTime());
             notification.setUserData(event.getContext());