RFR(S): 8227645: Some tests in serviceability/sa run with fixed -Xmx values and risk running out of memory​

[Chris Plummer]

Hello,

Please review the following:
http://cr.openjdk.java.net/~cjplummer/8227645/webrev.00/webrev.open/
https://bugs.openjdk.java.net/browse/JDK-8227645

I moved the offending tests to their own directory and added 
"exclusiveAccess.dirs=." for that directory. There were two extra 
support classes I had to move also (they aren't tests), and also a minor 
@library fix due to a dependency on another file in the sa test directory.

thanks,

Chris