Sends a request to the validator and parses the response.

async def _query_validator(self, request_type, response_proto,
                               payload, error_traps=None):
        """Sends a request to the validator and parses the response.
        """
        LOGGER.debug(
            'Sending %s request to validator',
            self._get_type_name(request_type))

        payload_bytes = payload.SerializeToString()
        response = await self._send_request(request_type, payload_bytes)
        content = self._parse_response(response_proto, response)

        LOGGER.debug(
            'Received %s response from validator with status %s',
            self._get_type_name(response.message_type),
            self._get_status_name(response_proto, content.status))

        self._check_status_errors(response_proto, content, error_traps)
        return self._message_to_dict(content)