Simplify test configs.

  - No more need to specify packages="blah".
  - Yes, I did run _all_ the unit tests before committing this time :P

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1585252 13f79535-47bb-0310-9956-ffa450edef68