Try to avoid the current modification exceptions that hapen sometimes on shutdown. We don't need Jetty to have its own shutdown thread as the Tuscany code should always being shutting down the jetty server

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@884485 13f79535-47bb-0310-9956-ffa450edef68

sca-java-2.x/trunk/modules/host-jetty/src/main/java/org/apache/tuscany/sca/http/jetty/JettyServer.java

@@ -123,6 +123,8 @@ public class JettyServer implements ServletHost, LifeCycleListener {
 
                 keyStoreType = System.getProperty("javax.net.ssl.keyStoreType", KeyStore.getDefaultType());
                 trustStoreType = System.getProperty("javax.net.ssl.trustStoreType", KeyStore.getDefaultType());
+
+                System.setProperty("JETTY_NO_SHUTDOWN_HOOK", "true");                
                 return null;
             }
         });