rpl_ndb tests on sapsrv1.


sql/ha_ndbcluster_binlog.cc:
  Try to fix assertion failures at slave shutdown when running
  rpl_ndb tests. If the binlog thread is killed, which happens during
  shutdown, open_tables returns error without setting an error
  in THD. Therefore one can't access thd->main_da.message() if thd->killed.