fix use_syslog config option
fix use_syslog config option

mrkeng/alerta,skob/alerta,skob/alerta,0312birdzhang/alerta,skob/alerta,skob/alerta,mrkeng/alerta,guardian/alerta,mrkeng/alerta,guardian/alerta,guardian/alerta,mrkeng/alerta,guardian/alerta,0312birdzhang/alerta,0312birdzhang/alerta