JDK 9 RFR of JDK-8038330: tools/jar/JarEntryTime.java fails intermittently on checking extracted file last modified values are the current times

[Amy Lu]

Please review the patch for test tools/jar/JarEntryTime.java

In which two issues fixed:

1. Test fails intermittently on checking the extracted files' 
last-modified-time are the current times.
    Instead of compare the file last-modified-time with pre-saved time 
value “now” (which is the time *before* current time, especially in a 
slow run, the time diff of “now” and current time is possible greater 
than 2 seconds precision (PRECISION)), test now compares the extracted 
file’s last-modified-time with newly created file last-modified-time.
2. Test may fail if run during the Daylight Saving Time change.


bug: https://bugs.openjdk.java.net/browse/JDK-8038330
webrev: http://cr.openjdk.java.net/~amlu/8038330/webrev.00/

Thanks,
Amy