[8u] RFR 8177560: @headful key can be removed from the tests for JavaSound

[Zhengyu Gu]

Hi,

Please review this 8u backport for Oracle parity.

The original patch does not apply cleanly.

The only conflicts are in 
test/javax/sound/midi/Devices/InitializationHang.java file.
1) Copyright year does not match
2) 8u version does not have @headful key

Original bug: https://bugs.openjdk.java.net/browse/JDK-8177560
Original patch: http://hg.openjdk.java.net/jdk9/jdk9/jdk/rev/41703cb17ee1

8u webrev: http://cr.openjdk.java.net/~zgu/JDK-8177560-8u/webrev.00/

Test:
   javax/sound on Linux x86_64

Thanks,

-Zhengyu