RFR (xxs) 8147617: [TESTBUG] jtreg tests try to build non existing packages

[Dmitry Fazunenko]

Hello,

May I have a couple of reviews for a tiny fix:
   https://bugs.openjdk.java.net/browse/JDK-8147617
webrev:
   http://cr.openjdk.java.net/~dfazunen/8147617/webrev.00/

The tests will start failing after switch to the next jtreg build.

Thanks,
Dima