[11]RFR: 8198819: tools/jimage/JImageExtractTest.java, fails intermittently at testExtract (macos)

[Srinivas Dama]

Hi,

Please review 
webrev: http://cr.openjdk.java.net/~sdama/8198819/webrev.01/ 
Bug: https://bugs.openjdk.java.net/browse/JDK-8198819 

Modified test to work only on modules extracted using jimage instead of considering already existing files
in current directory and treating them as bad Modules.

Regards,
Srinivas