RFR(S) : 8233462 : serviceability/tmtools/jstat tests times out with -Xcomp

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev//8233462/webrev.00
> 33 lines changed: 1 ins; 14 del; 18 mod;

Hi all,

could you please review this small fix for tmtools testlibrary?
tmtools tests are believed to fail due to a deadlock-like situation b/w main test process and tmtools process:
(from JBS)
> it seems these tests attach jstat to the main test process, the same process which reads the tool's stdout/stderr, so there is a possibility that this will deadlock: jstat-process produces more output than the buffer can hold, so it blocks till someone (the main process reads it), while the main process waits till jstat completes. 

the patch changes serviceability/tmtools/share/common library (used by all serviceability/tmtools) to redirect tmtool's stdout and stderr into files instead of using jdk.test.lib.process.OutputAnalyzer; I've also added a bit of diagnostic output, so it will be easier to analyze future failures.

webrev: http://cr.openjdk.java.net/~iignatyev//8233462/webrev.00
JBS: https://bugs.openjdk.java.net/browse/JDK-8233462
testing:
 - serviceability/tmtools on windows-x64,linux-x64,macosx-x64,solaris-sparcv9
 - serviceability/tmtools 100 times on linux-x64-debug w/ '-Xcomp -ea -esa -XX:+TieredCompilation -XX:+DeoptimizeALot' (most of failures have been seen on this configuration)

Thanks,
-- Igor