Revert "Route statements in larger batches"

This reverts commit f3c83770903151a0a3b53593c3e05fa0af94cd5f. The
functionality was used implicitly by modules that declare the
RCAP_TYPE_CONTIGUOUS_OUTPUT capability.

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

@@ -778,6 +778,11 @@ 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;