Galera MTR Tests: fortify galera_bf_abort_flush_for_export against sporadic failures.

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

@@ -6,9 +6,10 @@ SET SESSION wsrep_sync_wait = 0;
 UNLOCK TABLES;
 COMMIT;
 SET AUTOCOMMIT=ON;
-SELECT * FROM t1;
-f1
-2
+SET SESSION wsrep_sync_wait = 7;
+SELECT COUNT(*) = 1 FROM t1;
+COUNT(*) = 1
+1
 wsrep_local_aborts_increment
 1
 DROP TABLE t1;

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

@@ -27,9 +27,8 @@ UNLOCK TABLES;
 
 COMMIT;
 SET AUTOCOMMIT=ON;
---let $wait_condition = SELECT COUNT(*) = 1 FROM t1
---source include/wait_condition.inc
-SELECT * FROM t1;
+SET SESSION wsrep_sync_wait = 7;
+SELECT COUNT(*) = 1 FROM t1;
 
 --let $wsrep_local_bf_aborts_after = `SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_local_bf_aborts'`