move lockmode from scan operation to operation
    added read tuple with lock mode


ndb/include/ndbapi/NdbIndexOperation.hpp:
  added read tuple with lock mode
ndb/include/ndbapi/NdbOperation.hpp:
  move lockmode from scan operation to operation
ndb/include/ndbapi/NdbScanOperation.hpp:
  move lockmode from scan operation to operation
ndb/src/ndbapi/NdbIndexOperation.cpp:
  added read tuple with lock mode
ndb/src/ndbapi/NdbOperationDefine.cpp:
  added read tuple with lock mode
sql/ha_ndbcluster.cc:
  set correct lockmode in all reads...
  moved lockmode from scan operatoin to operation