RFR (XS): 8009427: Re-enable tests that were disable to ease complicated push

[Erik Helin]

Hi all,

the tests for jstat can be re-enabled now that jstat and the tests for 
jstat have been updated to account for metaspace changes [0].

This change removes the jstat tests (and one jstatd test) from 
ProblemList.txt.

Webrev:
http://cr.openjdk.java.net/~ehelin/8009427/webrev.00/

Bug:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8009427

Thanks,
Erik

[0]: http://hg.openjdk.java.net/jdk8/tl/jdk/rev/518d6087e01f