DERBY-6625: Make the JUnit tests correctly resolve the location of the engine jar when running on compact profile 2; tests passed cleanly on derby-6625-01-aa-useBasicEmbeddedDataSource40.diff.

git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1606831 13f79535-47bb-0310-9956-ffa450edef68