fix maven plugin to wait until stop thread has been called by making thread non deamon

activemq-maven-plugin/src/main/java/org/apache/activemq/server/ActiveMQBootstrap.java

@@ -135,7 +135,7 @@ public class ActiveMQBootstrap
             {
                restartFile.delete();
             }
-            final Timer timer = new Timer("ActiveMQ Server Shutdown Timer", true);
+            final Timer timer = new Timer("ActiveMQ Server Shutdown Timer", false);
             timer.scheduleAtFixedRate(new ServerStopTimerTask(stopFile, killFile, restartFile, timer), 500, 500);
          }
       }