storage/ndb/include/ndbapi/NdbEventOperation.hpp:
  event merge false by default => change option name
storage/ndb/ndbapi-examples/ndbapi_event/ndbapi_event.cpp:
  event merge false by default => change option name
storage/ndb/src/ndbapi/NdbEventOperation.cpp:
  event merge false by default => change option name
storage/ndb/src/ndbapi/NdbEventOperationImpl.cpp:
  event merge false by default => change option name
storage/ndb/src/ndbapi/NdbEventOperationImpl.hpp:
  event merge false by default => change option name
storage/ndb/test/ndbapi/test_event.cpp:
  event merge false by default => change option name
storage/ndb/test/ndbapi/test_event_merge.cpp:
  event merge false by default => change option name