CMS7-5969:
- clean up some code (remove commented out old code, reformat, guard
  against NPE).
- evict all caches upon close of JDO connection.  This will evict POJO
  objects previously retrieved that linger around too long.  These objects
  are managed and their storemanager indirectly has a listener registered
  for new classes on the class path.  This register holds a refrence to
  a whole JCR session.