Updated stop_ndbcluster script


mysql-test/ndb/stop_ndbcluster:
  Allow script to run even if pidfile does not exist
  This is done so that it will try to connect to mgmtsrvr an stop all running ndb nodes.
  NOTE! It would be good if also the mgmtsrv could "stop itself"
mysql-test/r/ndb_index_ordered.result:
  Add table with two index columns to test
mysql-test/t/ndb_index_ordered.test:
  Add table with two index columns to test