RFR 9: 8081566: java/lang/ProcessHandle/InfoTest.java failed on case sensitive command

[Roger Riggs]

Please review this testbug fix to correctly check the reported command name.
On Windows the command filename may differ only by case
and should be checked to see if they are the same file, not just the 
same string.

webrev:
     http://cr.openjdk.java.net/~rriggs/webrev-infotest-8081566/

Issue:
     https://bugs.openjdk.java.net/browse/JDK-8081566

Thanks, Roger