o Added a setDnFactory() method in the DirectoryService interface, as we need to inject the DnFactory into the DS
o The DnFactory instance is nullified when the DS is shutdown so we can restart it with a brand new DnFactory

git-svn-id: https://svn.apache.org/repos/asf/directory/apacheds/trunk@1520607 13f79535-47bb-0310-9956-ffa450edef68