Update galera_gtid_slave result file post merge

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

+connect node_2a, 127.0.0.1, root, , test, $NODE_MYPORT_2;
+connection node_2;
 START SLAVE;
+connection node_1;
 CREATE TABLE t1 (f1 INTEGER PRIMARY KEY) ENGINE=InnoDB;
 CREATE TABLE t2 (f1 INTEGER PRIMARY KEY) ENGINE=InnoDB;
 INSERT INTO t1 VALUES(1);
@@ -9,18 +12,25 @@ commit;
 SELECT @@global.gtid_binlog_state;
 @@global.gtid_binlog_state
 1-1-4
+connection node_2;
 INSERT INTO t1 VALUES(2);
 INSERT INTO t1 VALUES(3);
 SELECT @@global.gtid_binlog_state;
 @@global.gtid_binlog_state
 1-1-4,2-2-2
+connect node_3, 127.0.0.1, root, , test, $NODE_MYPORT_3;
 INSERT INTO t1 VALUES(4);
 SELECT @@global.gtid_binlog_state;
 @@global.gtid_binlog_state
 1-1-4,2-2-2,2-3-3
+connection node_1;
 DROP TABLE t1,t2;
 reset master;
+connection node_2;
+connection node_3;
+connection node_2;
 STOP SLAVE;
 RESET SLAVE ALL;
 reset master;
+connection node_3;
 reset master;