[11] Review request: 8198858: Remove use of internal packages of core modules from unit tests

[Kevin Rushforth]

Ajit and Ambarish,

Please review the following to cleanup references to internal core 
packages from our unit tests:

https://bugs.openjdk.java.net/browse/JDK-8198858
http://cr.openjdk.java.net/~kcr/8198858/webrev.00/

Thanks.

-- Kevin