MDEV-18590 galera.versioning_trx_id: Test failure: mysqltest: Result content mismatch

Ignore warning.

mysql-test/suite/galera/r/versioning_trx_id.result

 connection node_2;
 connection node_1;
+call mtr.add_suppression("Sending JOIN failed:.*");
 connect node_3, 127.0.0.1, root, , test, $NODE_MYPORT_3;
 connection node_1;
 create table t1 (a int, s bigint unsigned as row start, e bigint unsigned as row end, period for system_time(s,e)) engine=InnoDB with system versioning;

mysql-test/suite/galera/t/versioning_trx_id.test

 --source include/galera_cluster.inc
 
+call mtr.add_suppression("Sending JOIN failed:.*");
+
 --connect node_3, 127.0.0.1, root, , test, $NODE_MYPORT_3
 
 --connection node_1