Ticket 48743 - If a cipher is disabled do not attempt to look it up
    
    Description:  Even if a SSL cipher is disabled the server still attempts
                  to locate the cipher in the security library.  If the disabled
                  cipher is unknown it logs a warning at server startup, but
                  if it's disabled there is no reason to check if it exists.
    
    https://fedorahosted.org/389/ticket/48743
    
    Reviewed by: nhosoi(Thanks!)