use new sendSignal method instead
    new send signal method which sends segments
    remove unused method sendFragmentedSignalUnCond


ndb/src/ndbapi/NdbScanOperation.cpp:
  scan should not send fragmented signal
  use new sendSignal method instead
ndb/src/ndbapi/TransporterFacade.cpp:
  new send signal method which sends segments
ndb/src/ndbapi/TransporterFacade.hpp:
  new send signal method which sends segments
  remove unused method sendFragmentedSignalUnCond