Ticket 47613 - Impossible to configure nsslapd-allowed-sasl-mechanisms
    
    Bug Description:  The design doc sasy you can use comma separated list of supported mechanisms,
                      but in fact this was not supported.
    
    Fix Description:  Allow comma separated lists.
    
    https://fedorahosted.org/389/ticket/47613
    
    Reviewed by: richm(Thanks!)
    (cherry picked from commit 6200f6812682760cd2a54d6a3bcbb009a0dffe79)
    (cherry picked from commit f1461312fc9e221413b19d6babbdf5a886794d10)