RFR: JDK-8131784 : Add tracing info to LowMemoryTest.java to help 8130339 diagnosis

[olivier.lagneau at oracle.com]

Hi,

Could you please review this fix:
bug: https://bugs.openjdk.java.net/browse/JDK-8131784
webrev: http://cr.openjdk.java.net/~olagneau/8131784/webrev.00/

We add tracing information to help diagnosing master bug problem 
(https://bugs.openjdk.java.net/browse/JDK-8130339),
and we will monitor the quarantined runs to check for any failure and 
get more diagnosis info.

Since the test already provides some information which is not collected 
when it fails with timeout,
the idea is to collect subprocess I/O (stdout, stderr) by using 
ProcessTools.startProcess rather
that OutputAnalyzer.executeProcess. The subprocess I/Os will be 
collected while it's running
rather than waiting the subprocess termination.

A few additional infos have also been added to get more information.

Note that this "tracing" change should be temporary and will be removed 
when a fix for 8130339 has been found.

Thanks,
Olivier.

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