Review quest for bug 8022879: sun/nio/cs/MalformedSurrogates.java fails intermittently

[Eric Wang]

Hi,

Please help to review the fix below for bug 
https://jbs.oracle.com/bugs/browse/JDK-8022879

http://cr.openjdk.java.net/~ewang/8022879/webrev.00/

The test has defect as it wouldn't be executed if the file.encoding is 
UTF-8 (lots of test machines in nightly are UTF-8), it also doesn't 
check UTF-16 and UTF-32 which can cause test fail too.

The fix is to check whether the default charset is unicode, if yes, use 
US-ASCII to test instead.

Thanks,
Eric