<AWT Dev> RFR(S): 8191678: [TESTBUG] Add keyword headful in java/awt and javax tests.

[Lindenmaier, Goetz]

Hi,

I added @key headful to some more tests where it was missing. 
Also, I fixed some NPEs I get when running the tests headless.
Please review.
http://cr.openjdk.java.net/~goetz/wr17/8191678-headfulKey/webrev.01/

Best regards,
  Goetz.