RFR: 8230942: Support compressed cores in SA tests

[Leonid Mesnik]

Hi

Some hosts used for JDK testing have customized core dump settings. They compress core files saved in current directory on-the-fly to reduce required disk space.
This fix adopt several SA tests, trying to unpack core.pid.gz before test process it with jhsdb. It affects only execution in the case if core.pid.gz files are actually generated.

Verified that tests are passed and not skipped anymore on default and new configurations.

webrev: http://cr.openjdk.java.net/~lmesnik/8230942/webrev.00/ <http://cr.openjdk.java.net/~lmesnik/8230942/webrev.00/>
bug: https://bugs.openjdk.java.net/browse/JDK-8230942 <https://bugs.openjdk.java.net/browse/JDK-8230942>

Leonid
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