Ticket #48133 - Non tombstone entry which dn starting with "nsuniqueid=...," cannot be deleted
    
    Bug Description: Trying to delete an entry which DN starts with
    "nsuniqueid=...," but no objectclass=nsTombstone fails with
    "Turning a tombstone into a tombstone!", which is indeed not.
    
    Fix Description: This patch checks the entry and if it does not
    have "objectclass=nsTombstone", the entry is not treated as a
    tombstone.  Also, if the DN already has the entry's nsuniqueid
    at the beginning, it does not get appended to avoid the duplicate.
    
    Note: Adding an entry which DN starts with "nsuniqueid" and no
    nsTombstone objectclass fails since such an entry is rejected in
    check_rdn_for_created_attrs called from do_add.
    
    https://fedorahosted.org/389/ticket/48133
    
    Reviewed by rmeggins@redhat.com (Thank you, Rich!!)