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

def _update_limits_from_api(self):
        """
        Query DynamoDB's DescribeLimits API action, and update limits
        with the quotas returned. Updates ``self.limits``.
        """
        self.connect()
        logger.info("Querying DynamoDB DescribeLimits for limits")
        # no need to paginate
        lims = self.conn.describe_limits()
        self.limits['Account Max Read Capacity Units']._set_api_limit(
            lims['AccountMaxReadCapacityUnits']
        )
        self.limits['Account Max Write Capacity Units']._set_api_limit(
            lims['AccountMaxWriteCapacityUnits']
        )
        self.limits['Table Max Read Capacity Units']._set_api_limit(
            lims['TableMaxReadCapacityUnits']
        )
        self.limits['Table Max Write Capacity Units']._set_api_limit(
            lims['TableMaxWriteCapacityUnits']
        )
        logger.debug("Done setting limits from API")