8159690: [TESTBUG] Mark headful tests with @key headful.
Reviewed-by: simonis, alexsch
<html>
<!--
@test
@key headful
@bug 4051487 4145670
@summary Tests that disposing of an empty Frame or a Frame with a MenuBar
while it is being created does not crash the VM.
@author dpm area=Threads
@run applet/timeout=7200 DisposeStressTest.html
-->
<head>
<title>DisposeStressTest</title>
</head>
<body>
<h1>DisposeStressTest<br>Bug ID: 4051487, 4145670</h1>
<p> This is an AUTOMATIC test, simply wait for completion </p>
<APPLET CODE="DisposeStressTest.class" WIDTH=200 HEIGHT=200></APPLET>
</body>
</html>