Refactor DN and RDN classes and improve their test coverage.

matthew_swift

03.39.2006 59685c84348f8d71dc3bbd3513c5eb10cc738a8e

 opends/src/server/org/opends/server/tools/LDIFSearch.java

@@ -521,7 +521,7 @@
    }
    else
    {
      baseDNs.add(new DN());
      baseDNs.add(DN.nullDN());
    }