MDEV-20916: Galera test failure on galera.galera_parallel_autoinc_largetrx: Result content mismatch

Add wait_condition to make sure that node contains all the rows
expected.

mysql-test/suite/galera/disabled.def

@@ -21,7 +21,6 @@ galera_binlog_stmt_autoinc : MDEV-19959 Galera test failure on galera_binlog_stm
 galera_gcache_recover_manytrx : MDEV-18834 Galera test failure
 galera_ist_progress : MDEV-15236 fails when trying to read transfer status
 galera_load_data : MDEV-19968 galera.galera_load_data
-galera_parallel_autoinc_largetrx : MDEV-20916 galera.galera_parallel_autoinc_largetrx
 galera_parallel_simple : MDEV-20318 galera.galera_parallel_simple fails	
 galera_shutdown_nonprim : MDEV-21493 galera.galera_shutdown_nonprim
 galera_ssl_upgrade : MDEV-19950 Galera test failure on galera_ssl_upgrade

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

@@ -15,11 +15,11 @@ connection node_1;
 connection node_1a;
 connection node_2;
 disconnect node_1a;
-SELECT COUNT(*) FROM t1;
-COUNT(*)
+SELECT COUNT(*) AS EXPECT_30000 FROM t1;
+EXPECT_30000
 30000
-SELECT COUNT(DISTINCT f1) FROM t1;
-COUNT(DISTINCT f1)
+SELECT COUNT(DISTINCT f1) AS  EXPECT_30000 FROM t1;
+EXPECT_30000
 30000
 connection default;
 DROP TABLE t1;

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

@@ -44,8 +44,12 @@ SET GLOBAL wsrep_slave_threads = 4;
 --connection node_2
 --reap
 --disconnect node_1a
-SELECT COUNT(*) FROM t1;
-SELECT COUNT(DISTINCT f1) FROM t1;
+
+--let $wait_condition = SELECT COUNT(*) = 30000 FROM t1;
+--source include/wait_condition.inc
+
+SELECT COUNT(*) AS EXPECT_30000 FROM t1;
+SELECT COUNT(DISTINCT f1) AS  EXPECT_30000 FROM t1;
 
 --disable_query_log
 --eval SET GLOBAL wsrep_slave_threads = $wsrep_slave_threads_orig;