Route statements in larger batches

The RCAP_TYPE_STMT_OUTPUT is not used in its previous form. It can be
altered to route only complete packets back to the client. This allows
routers to do safer parsing on the results.

server/modules/protocol/MySQL/MySQLBackend/mysql_backend.c

@@ -778,11 +778,6 @@ gw_read_and_write(DCB *dcb)
                 return 0;
             }
         }
-        else if (rcap_type_required(capabilities, RCAP_TYPE_STMT_OUTPUT) &&
-                 !rcap_type_required(capabilities, RCAP_TYPE_RESULTSET_OUTPUT))
-        {
-            stmt = modutil_get_next_MySQL_packet(&read_buffer);
-        }
         else
         {
             stmt = read_buffer;