Query EC2's DescribeAccountAttributes API action, and update limits
        with the quotas returned. Updates ``self.limits``.

def _update_limits_from_api(self):
        """
        Query EC2's DescribeAccountAttributes API action, and update limits
        with the quotas returned. Updates ``self.limits``.
        """
        self.connect()
        logger.info("Querying EC2 DescribeAccountAttributes for limits")
        lims = self.conn.describe_account_limits()
        self.limits['Auto Scaling groups']._set_api_limit(
            lims['MaxNumberOfAutoScalingGroups'])
        self.limits['Launch configurations']._set_api_limit(
            lims['MaxNumberOfLaunchConfigurations'])