Ticket 534 - RFE: Add SASL mappings fallback
    
    Bug Description:  The function for removing entries from the list of SASL
                      mappings causes segmentation faults.
    
    Fix Description:  Use correct double-linked list deletion routine in the
                      function.
    
    https://fedorahosted.org/389/ticket/534
    
    Reviewed by: mreynolds