Galera MTR Tests: Attempt to fortify galera_kill_ddl.test against sporadic failures

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

@@ -5,7 +5,4 @@ ALTER TABLE t1 ADD COLUMN f2 INTEGER;
 SELECT COUNT(*) = 2 FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='t1';
 COUNT(*) = 2
 1
-SELECT VARIABLE_VALUE = 2 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_size';
-VARIABLE_VALUE = 2
-1
 DROP TABLE t1;

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

@@ -28,8 +28,13 @@ ALTER TABLE t1 ADD COLUMN f2 INTEGER;
 --source include/galera_connect.inc
 --connection node_2a
 
+--let $wait_condition = SELECT VARIABLE_VALUE = 2 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_size';
+--source include/wait_condition.inc
+
+--let $wait_condition = SELECT VARIABLE_VALUE = 'Primary' FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_status';
+--source include/wait_condition.inc
+
 SELECT COUNT(*) = 2 FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='t1';
-SELECT VARIABLE_VALUE = 2 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_size';
 
 --connection node_1
 --disable_query_log