RFR (S) 8167548: [TESTBUG] Logging tests put log files in source tree

[Harold Seigel]

Hi,

Please review this fix for JDK-8167548.  The test used the wrong 
'predictable' file names so the files were not getting deleted.

Open Webrev: 
http://cr.openjdk.java.net/~hseigel/bug_8167548/webrev/index.html

JBS Bug:  https://bugs.openjdk.java.net/browse/JDK-8167548

The fix was tested by hand on Linux x64 to make sure the files were 
deleted.  It was also regression tested on Windows, Solaris, and Mac.

Thanks, Harold