Switching to using index_read() instead of index_read_idx() since a
range of rows need to be retrieved.


mysql-test/r/rpl_row_basic_8partition.result:
  Result change
mysql-test/t/rpl_row_basic_8partition.test:
  Enabling section for testing PARTITION BY KEY().
sql/log_event.cc:
  Using index_read() instead of index_read_idx() since a range of records
  are read using index_next().
mysql-test/extra/rpl_tests/rpl_partition.test:
  New BitKeeper file ``mysql-test/extra/rpl_tests/rpl_partition.test''