RFR[9] JDK-8166439: Test sun/security/tools/jarsigner/nameclash.sh needs to output more details

[John Jiang]

Hi,
I'm looking into JDK-8164827: sun/security/tools/jarsigner/nameclash.sh 
timeout
But I cannot reproduce this issue, and the test didn't display any 
useful info.
This patch takes this test to output more details.

Webrev: http://cr.openjdk.java.net/~jjiang/8166439/webrev.00/
Issue: https://bugs.openjdk.java.net/browse/JDK-8166439

Best regards,
John Jiang