MDEV-13549: Galera test failures

Test did not reset modified variables correctly.

mysql-test/suite/galera/disabled.def

@@ -25,7 +25,6 @@ galera_gcache_recover_full_gcache : MDEV-13549 Galera test failures
 galera_gcache_recover_manytrx : MDEV-13549 Galera test failures
 galera_ist_mysqldump : MDEV-13549 Galera test failures
 galera_ssl_upgrade : MDEV-13549 Galera test failures
-mysql-wsrep#33 : MDEV-13549 Galera test failures
 galera_var_auto_inc_control_on : MDEV-13549 Galera test failures
 MW-44 : MDEV-13549 Galera test failures
 galera_var_retry_autocommit : MDEV-13549 Galera test failures

mysql-test/suite/galera/r/mysql-wsrep#33.result

 Setting SST method to mysqldump ...
+call mtr.add_suppression("WSREP: wsrep_sst_method is set to 'mysqldump' yet mysqld bind_address is set to '127.0.0.1'");
+call mtr.add_suppression("Failed to load slave replication state from table mysql.gtid_slave_pos");
 CREATE USER 'sst';
 GRANT ALL PRIVILEGES ON *.* TO 'sst';
 SET GLOBAL wsrep_sst_auth = 'sst:';
@@ -100,5 +102,4 @@ CALL mtr.add_suppression("Can't open and lock time zone table");
 CALL mtr.add_suppression("Can't open and lock privilege tables");
 CALL mtr.add_suppression("Info table is not ready to be used");
 CALL mtr.add_suppression("Native table .* has the wrong structure");
-SET GLOBAL general_log = ON;
-SET GLOBAL slow_query_log = ON;
+Restarting server ...

mysql-test/suite/galera/t/mysql-wsrep#33.test

@@ -3,6 +3,9 @@
 --source include/galera_cluster.inc
 --source include/have_innodb.inc
 
+--let $node_1=node_1
+--let $node_2=node_2
+--source suite/galera/include/auto_increment_offset_save.inc
 --source suite/galera/include/galera_sst_set_mysqldump.inc
 
 --source suite/galera/include/galera_st_disconnect_slave.inc
@@ -10,9 +13,8 @@
 --source suite/galera/include/galera_sst_restore.inc
 
 --connection node_2
-# We have to manually restore global_log and slow_query_log due to mysql-wsrep#108
-# Otherwise MTR's check_testcases complains
 
-SET GLOBAL general_log = ON;
-SET GLOBAL slow_query_log = ON;
+--echo Restarting server ...
+--source include/restart_mysqld.inc
 
+--source suite/galera/include/auto_increment_offset_restore.inc