MDEV-21421 : Galera test sporadic failure on...

MDEV-21421 : Galera test sporadic failure on galera.galera_as_slave_gtid_myisam: Result length mismatch

    In Galera 3 nodes 2 and 3 are galera nodes and node_1 should be
    non galera.

mysql-test/suite/galera/disabled.def

@@ -15,7 +15,6 @@ MW-328A : MDEV-21483 galera.MW-328A galera.MW-328B
 MW-328B : MDEV-21483 galera.MW-328A galera.MW-328B
 MW-329 : MDEV-19962 Galera test failure on MW-329
 galera.galera_defaults : MDEV-21494 Galera test sporadic failure on galera.galera_defaults
-galera_as_slave_gtid_myisam : MDEV-21421 galera.galera_as_slave_gtid_myisam
 galera_as_slave_replication_bundle : MDEV-15785 OPTION_GTID_BEGIN is set in Gtid_log_event::do_apply_event()
 galera_autoinc_sst_mariabackup : Known issue, may require porting MDEV-17458 from later versions
 galera_binlog_stmt_autoinc : MDEV-19959 Galera test failure on galera_binlog_stmt_autoinc	

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

 connect node_2a, 127.0.0.1, root, , test, $NODE_MYPORT_2;
+SELECT @@WSREP_ON;
+@@WSREP_ON
+0
 connection node_2;
 ALTER TABLE mysql.gtid_slave_pos engine = InnoDB;
 START SLAVE;

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

@@ -16,6 +16,7 @@
 # As node #1 is not a Galera node, we connect to node #2 in order to run include/galera_cluster.inc
 --connect node_2a, 127.0.0.1, root, , test, $NODE_MYPORT_2
 --source include/galera_cluster.inc
+SELECT @@WSREP_ON;
 
 --connection node_2
 # make sure gtid_slave_pos is of innodb engine, mtr does not currently provide that