Galera MTR Tests: Fortify galera_restart_nochanges.test against sporadic...

Galera MTR Tests: Fortify galera_restart_nochanges.test against sporadic failures due to node not being ready immediately after restart

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

@@ -18,6 +18,10 @@ INSERT INTO t1 VALUES (1);
 --connection node_2
 --source include/restart_mysqld.inc
 
+--connection node_1
+--let $wait_condition = SELECT VARIABLE_VALUE = 2 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_size';
+--source include/wait_condition.inc
+
 --let $galera_connection_name = node_2a
 --let $galera_server_number = 2
 --source include/galera_connect.inc