add script to convert v1 alerts to v2
add script to convert v1 alerts to v2

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