Remove mod_ssl conflict
    
    Since mod_nss-1.0.8-24, mod_nss and mod_ssl can co-exist on one
    machine (of course, when listening to different ports).
    
    To make sure that mod_ssl is not configured to listen on 443
    (default mod_ssl configuration), add a check to the installer checking
    of either mod_nss or mod_ssl was configured to listen on that port.
    
    https://fedorahosted.org/freeipa/ticket/3974