Remove disabling of rpl_ndb_multi_update2

mysql-test/t/disabled.def

@@ -36,7 +36,6 @@ rpl_ndb_insert_ignore   : Bugs: #17431: INSERT IGNORE INTO returns failed: 1296
 rpl_ndb_myisam2ndb      : Bug#18261: Cluster Replication: tests rpl_ndb_xxx2ndb fails
 #rpl_ndb_log             : result not deterministic
 rpl_ndb_relay_space     : Bug#16993
-rpl_ndb_multi_update2   : BUG#17738 In progress
 #rpl_ndb_multi_update3   : Bug#17400: delete & update of rows in table without pk fails
 rpl_ndb_sp007           : Bug #17290
 rpl_row_inexist_tbl     : Disabled since patch makes this test wait forever