[9] RFR(S): 8066433: Copy Whitebox testlibrary to /jdk/test

[Tobias Hartmann]

Hi,

please review the following patch that copies the Whitebox testlibrary to
/jdk/test. This is needed to enhance and fix jdk tests (for example, see [1]).

The change leads to code duplication but in my opinion we should favour stable
tests over code duplication here. Hopefully, there is a solution to share the
library in the future.

Bug: https://bugs.openjdk.java.net/browse/JDK-8066433
Webrev: http://cr.openjdk.java.net/~thartmann/8066433/webrev.00/

Thanks,
Tobias