ndb/include/ndbapi/NdbConnection.hpp:
  release scan op of hupped trans at scan close to save memory
ndb/include/ndbapi/NdbScanOperation.hpp:
  release scan op of hupped trans at scan close to save memory
ndb/src/ndbapi/NdbConnection.cpp:
  release scan op of hupped trans at scan close to save memory
ndb/src/ndbapi/NdbResultSet.cpp:
  release scan op of hupped trans at scan close to save memory
ndb/src/ndbapi/NdbScanOperation.cpp:
  release scan op of hupped trans at scan close to save memory
ndb/tools/desc.cpp:
  release scan op of hupped trans at scan close to save memory