regression test suite for 5.0u16b05-rev

test: j2se/java/awt/Multiscreen/WPanelPeerPerf/WPanelPeerPerf.java

result: Failed. Execution failed: `main' threw exception: java.lang.RuntimeException: Test must be run on a multiscreen system

test checked for existing multiscreens
....
      // fail if only on one screen
        int numScreens = GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices().length;
        if (numScreens < 2) {
            throw new RuntimeException("Test must be run on a multiscreen system");
        }
....

So test as written in source comments 'fail if only on one screen', I think it is logically to make it Passed if only one screen exist because every time we run tests we will see it in unexpected failures, so may be it better to add System.exit(0) in this 'if' block