RFR: 8041980 + 6461635

[Andreas Eriksson]

Summary:
This is a backport of a change that fixes problems with jvmstat, where 
it can't find local JVM processes.
Also backported is a change that improves tests related to this area.

I could not run the regression tests on solaris_sparcv9 or solaris_x64 
due to a JPRT limitation.
All other platforms show no failures on JPRT with the added and modified 
regression test run as well.

Bugs:
JDK-8041979 <https://bugs.openjdk.java.net/browse/JDK-8041979> - 
sun/jvmstat/monitor/MonitoredVm/CR6672135.java failing on all platforms
JDK-6461635 <https://bugs.openjdk.java.net/browse/JDK-6461635> - 
BasicTests.sh test fails intermittently.

Webrev:
http://cr.openjdk.java.net/~aeriksso/6461635_8041979/webrev.00/

Regards,
Andreas