Galera test cleanup.

mysql-test/suite/galera/disabled.def

@@ -15,6 +15,7 @@ MW-328A : MDEV-17847 Galera test failure on MW-328[A|B|C]
 MW-328B : MDEV-17847 Galera test failure on MW-328[A|B|C]
 MW-328C : MDEV-17847 Galera test failure on MW-328[A|B|C]
 MW-329 : wsrep_local_replays not stable
+MW-336 : MDEV-19746 Galera test failures because of wsrep_slave_threads identification
 MW-416 : MDEV-13549 Galera test failures
 MW-44 : MDEV-15809 Test failure on galera.MW-44
 galera_account_management : MariaDB 10.0 does not support ALTER USER
@@ -38,6 +39,7 @@ galera_sst_xtrabackup-v2 : MDEV-17848 Galera test failure
 galera_sst_xtrabackup-v2_data_dir : MDEV-17848 Galera test failure
 galera_var_node_address : MDEV-17151 Galera test failure
 galera_var_notify_cmd : MDEV-13549 Galera test failures
+galera_var_slave_threads : MDEV-19746 Galera test failures because of wsrep_slave_threads identification
 galera_wan : MDEV-17259: Test failure on galera.galera_wan
 partition : MDEV-13549 regularly showing auto_increment mismatch
 pxc-421: Lock timeout exceeded

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

@@ -47,6 +47,8 @@ tr1	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE
 DROP TABLE t1;
 connection node_1;
 CREATE EVENT event1 ON SCHEDULE AT '2038-01-01 23:59:59' DO SELECT 1;
+Warnings:
+Warning	1105	Event scheduler is switched off, use SET GLOBAL event_scheduler=ON to enable it.
 connection node_2;
 SHOW CREATE EVENT event1;
 Event	sql_mode	time_zone	Create Event	character_set_client	collation_connection	Database Collation

mysql-test/suite/wsrep/disabled.def

+##############################################################################
+#
+#  List the test cases that are to be disabled temporarily.
+#
+#  Separate the test case name and the comment with ':'.
+#
+#    <testcasename> : MDEV-<xxxx> <comment>
+#
+#  Do not use any TAB characters for whitespace.
+#
+##############################################################################
 
+variables : MDEV-19746 Galera test failures because of wsrep_slave_threads identification