Assign address_type for any EC2 instance in powertest.py

        if options.crash_method == "aws_ec2" or not instance_running:

            ret, aws_status = ec2.control_instance(

                mode="start", image_id=options.instance_id, wait_time_secs=600, show_progress=True)

            LOGGER.info("Start instance: %d %s****", ret, aws_status)

            if ret:

                raise Exception("Start instance failed: {}".format(aws_status))

            if not hasattr(aws_status, address_type):

                raise Exception("Cannot determine address_type {} from AWS EC2 status {}".format(

                    address_type, aws_status))