8058726: Update regtests using sun.awt.OSInfo, part 1
Reviewed-by: alexsch

8006087: [TEST_BUG] The BACKSPACE key doesn't work and after pressing 'cancel' and 'DONE' button, the case pass automatically.
Reviewed-by: alexsch, serb

6988188: The test failed due to Applet thread threw exception
Reviewed-by: alexp