corrected documentation on fragmentation
    set "fragmentation medium" to mean 2 fragments per node instead of 1
    set default fragmentation to small instead of medium
    bug#8284 adjust fragmentation to max_rows


mysql-test/r/ndb_basic.result:
  added test to trigger drifferent fragmentations in ndb
mysql-test/t/ndb_basic.test:
  added test to trigger drifferent fragmentations in ndb
ndb/include/ndbapi/NdbDictionary.hpp:
  corrected documentation on fragmentation
ndb/src/kernel/blocks/dbdih/DbdihMain.cpp:
  set "fragmentation medium" to mean 2 fragments per node instead of 1
ndb/src/ndbapi/NdbDictionaryImpl.cpp:
  set default fragmentation to small instead of medium
sql/ha_ndbcluster.cc:
  bug#8284 adjust fragmentation to max_rows