JDK 9 RFR of JDK-8157211: Mark tools/launcher/FXLauncherTest.java as intermittently failing

[Hamlin Li]

tools/launcher/FXLauncherTest.java
This test is known to fail intermittently (JDK-8130392 
<https://bugs.openjdk.java.net/browse/JDK-8130392>), it should be marked 
accordingly with at key intermittentjtreg tag in the test file.

bug: https://bugs.openjdk.java.net/browse/JDK-8157211
webrev: http://cr.openjdk.java.net/~mli/8157211/webrev.00/

Thank you
-Hamlin

--- a/test/tools/launcher/FXLauncherTest.java Tue May 17 19:20:05 2016 -0700
+++ b/test/tools/launcher/FXLauncherTest.java    Tue May 17 21:44:18 
2016 -0700
@@ -29,6 +29,7 @@
   * jfx app class, a main-class for the manifest, a bogus one and none.
   * All should execute except the incorrect fx app class entries.
   * @run main/othervm FXLauncherTest
+ * @key intermittent
   */
  import java.io.File;
  import java.io.IOException;