The problem: data file can not be deleted on win because
there is another opened instance of this file.
Data file might be opened twice, on table opening stage and
during write_row execution. We need to close both instances
to satisfy Win.


mysql-test/r/csv.result:
  test result
mysql-test/t/csv.test:
  test case
storage/csv/ha_tina.cc:
  The problem: data file can not be deleted on win because
  there is another opened instance of this file.
  Data file might be opened twice, on table opening stage and
  during write_row execution. We need to close both instances
  to satisfy Win.