RFR: 8025502: Exclude tests due to JDK-8025427

[Erik Helin]

Hi all,

I need to exclude some tests due a recent change to jstat that caused to
jstat to output the \ufffd for Double.NaN, which confused the tests. I
am working on a solution to this, but in the meantime I would like to
exclude the tests in order not cause unexpected failures.

Webrev:
http://cr.openjdk.java.net/~ehelin/8025427/webrev.00/

Thanks,
Erik