BUG#21699 DROP last DATAFILE from TABLESPACE even though there are still table in it. And it gives the cofusing error message.


mysql-test/r/ndb_dd_basic.result:
  adding some test result for increasing test codes.
mysql-test/t/ndb_dd_basic.test:
  adding some test codes for nodatafile in tablespace.
storage/ndb/include/kernel/signaldata/Extent.hpp:
  Add NoDatafile error code when allocating extent.
storage/ndb/src/kernel/blocks/tsman.cpp:
  when there is no datafile in spacefile , it should return NoDatafile error code, rather than NoExtentAvailable.
storage/ndb/src/ndbapi/ndberror.c:
  add no datafile error code and corresponding error message for NoDatafile