<Swing Dev> RFR JDK-8242526: PIT: javax/swing/JInternalFrame/8020708/bug8020708.java fails in mach5 ubuntu system

[Prasanta Sadhukhan]

Hi All,

Please review a test fix for an issue seen in PIT where the test is 
failing on ubuntu 18.04 on mach5 system

The previous 8226230 fix fixes the issue in local ubuntu18.04 but it 
seems it sometimes still fail in mach5 ubuntu system.

Added some delay to ensure it passes in mach5 system too. Also, added 
debug message to show added log if it fails again in some other system.

Bug: https://bugs.openjdk.java.net/browse/JDK-8242526

webrev: http://cr.openjdk.java.net/~psadhukhan/8242526/webrev.0/

mach5 job trying several times is linked to JBS is green.

Regards
Prasanta