RFR [14] 8231297: java/lang/ProcessBuilder/Basic.java test fails intermittently

[Roger Riggs]

Please review this addition to a test to add diagnostic output.
There have been intermittent failures of ProcessBuilder/Basic.java that 
indicate
some output is being received from the child.  There should be none.
The additional output will be added to the log file along with the failure.

Jira Issue for the diagnostics:
  https://bugs.openjdk.java.net/browse/JDK-8232135

Base issue:
8231297 java/lang/ProcessBuilder/Basic.java test fails intermittently [1]

Webrev:
http://cr.openjdk.java.net/~rriggs/webrev-basic-intermittent-8231297-1/

[1] https://bugs.openjdk.java.net/browse/JDK-8231297

Thanks, Roger