<AWT Dev> [9] Review request for 8014755: [TEST_BUG] frames didn't closed after execution some awt/dnd/ tests

[Oleg Pekhovskiy]

Hi all,

please review the fix
http://cr.openjdk.java.net/~bagiras/9/8014755.1/
for
https://bugs.openjdk.java.net/browse/JDK-8014755

These tests were moved from the closed workspace.

The main idea of fix is to force termination of child JVM if it's not 
exited automatically after the test sequence.

Tests accuracy was improved to cover all error cases.

destroyProcess() method was added to
test.java.awt.regtesthelpers.process.ProcessCommunicator
for termination of child JVM when needed.

Thanks,
Oleg