Bug 684996 - Exported tombstone cannot be imported correctly
    
    https://bugzilla.redhat.com/show_bug.cgi?id=684996
    
    Description: When nsslapd-subtree-rename-switch is on,
    a tombstone entry has a special RDN which looks like this:
      nsuniqueid=042d8081-...-ca8fe9f7,<original_leaf_rdn>
    This special format was not treated properly.
    
    This patch adds the code to handle the special tombstone
    RDN, where an internal entry has the above RDN and points
    the correct parent entry.