Moved initialization code into a new init function.
Added a new cleanup function.
Added a call to close the meta file.



mysql-test/t/archive.test:
  Test Bug: Memory leaks in the archive handler.
  Fixed a typo.
sql/examples/ha_archive.h:
  Test Bug: Memory leaks in the archive handler.
  Added declarations for the new init/cleanup functions.
sql/handler.cc:
  Test Bug: Memory leaks in the archive handler.
  Added calls of the new init/cleanup functions.