only run tests against python 2.7
only run tests against python 2.7

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