sql/ha_ndbcluster.cc:
  Added new function set_bounds, used to set bounds in NDB from a key_range
  Updated ordered_index_scan to take start_key and end_key as parameters
  Override of functions read_range_first and read_range_next, to call appropriate access function in NDB
sql/ha_ndbcluster.h:
  Added functions set_bounds, read_range_first and read_range_next
  Changed declaration of ordered_index_scan