Fix syslog RFC 3164 message pattern match
Fix syslog RFC 3164 message pattern match

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