Adjust test to adapt to a recent change in mysqltest.

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

@@ -43,10 +43,10 @@ let $run=10;
 while($run)
 {
   --error 0,1
-  exec $MYSQL --user=root --host=127.0.0.1 --port=$NODE_MYPORT_1 test
-         < $MYSQLTEST_VARDIR/tmp/galera_concurrent.sql &
-       $MYSQL --user=root --host=127.0.0.1 --port=$NODE_MYPORT_2 test
-         < $MYSQLTEST_VARDIR/tmp/galera_concurrent.sql;
+  exec $MYSQL --user=root --host=127.0.0.1 --port=$NODE_MYPORT_1 test \
+    < $MYSQLTEST_VARDIR/tmp/galera_concurrent.sql & \
+    $MYSQL --user=root --host=127.0.0.1 --port=$NODE_MYPORT_2 test \
+    < $MYSQLTEST_VARDIR/tmp/galera_concurrent.sql;
   dec $run;
 }