MDEV-21806 : galera.galera_partition MTR failed: failed to recover from DONOR state

Add wait_condition to wait until all nodes are in cluster

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

@@ -424,3 +424,5 @@ connection node_4;
 connection node_1;
 DROP TABLE t1;
 DROP PROCEDURE p1;
+disconnect node_3;
+disconnect node_4;

mysql-test/suite/galera/t/galera_partition.cnf

@@ -3,16 +3,20 @@
 [mysqld.1]
 wsrep_provider_options='base_port=@mysqld.1.#galera_port;gcache.size=10M;gmcast.segment=1'
 wsrep_slave_threads=10
+wsrep_debug=1
 
 [mysqld.2]
 wsrep_provider_options='base_port=@mysqld.2.#galera_port;gcache.size=10M;gmcast.segment=1'
 wsrep_slave_threads=10
+wsrep_debug=1
 
 [mysqld.3]
 wsrep_provider_options='base_port=@mysqld.3.#galera_port;gcache.size=10M;gmcast.segment=2'
 wsrep_slave_threads=10
+wsrep_debug=1
 
 [mysqld.4]
 wsrep_provider_options='base_port=@mysqld.4.#galera_port;gcache.size=10M;gmcast.segment=3'
 wsrep_slave_threads=10
+wsrep_debug=1
 

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

@@ -11,6 +11,8 @@ call mtr.add_suppression("WSREP: ALTER TABLE isolation failure");
 --connect node_4, 127.0.0.1, root, , test, $NODE_MYPORT_4
 
 --connection node_1
+--let $wait_condition = SELECT VARIABLE_VALUE = 4 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_size';
+--source include/wait_condition.inc
 
 CREATE TABLE t1(
  id bigint unsigned NOT NULL AUTO_INCREMENT,
@@ -449,3 +451,7 @@ reap;
 DROP TABLE t1;
 DROP PROCEDURE p1;
 
+--disconnect node_3
+--disconnect node_4
+
+