[TEST BUG] Test closed/javax/swing/JTable/4416387/bug4416387.java doesn't always wait until frame fully displayed

On slower machines test closed/javax/swing/JTable/4416387/bug4416387.java doesn't always wait until JFrame is fully displayed. This results in incorrect test failures from time to time.

When we changed Util.blockTillDisplayed() to Thread.sleep(10000) and set robot autodelay to 500 ms the test always passes. Before that the test sporadically fails.