Ticket 47810 - RI plugin does not return result code if update fails
    
    Bug Description:  If using backend txns the initial delete operation should fail
                      if we fail to update the integrity.
    
    Fix Description:  If using backend txns, stop and return an error if we fail to
                      update the membership integrity.
    
    https://fedorahosted.org/389/ticket/47810
    
    Reviewed by: rmeggins(Thanks!)
    
    (cherry picked from commit c5cc125915023d03caa3548b8d55c5b8b8ce59aa)