DERBY-6648: Grant usederbyinternals permission to the classes directory to fix tests which don't run against the Derby jar files; commit derby-6648-02-aa-packagePrivateTests.diff.

git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1626757 13f79535-47bb-0310-9956-ffa450edef68