rli->save_temporary_tables and slave_open_temp_tables
(in old 4.0 you could make "SHOW STATUS LIKE 'slave_open_temp_tables'" grow
indefinitely by doing RESET SLAVE and replicating always the same CREATE
TEMPORARY TABLE).
It's critical to reset save_temporary_tables to 0 (otherwise you may later
read memory which has been freed) so this changeset should go into 4.1.


mysql-test/r/rpl_reset_slave.result:
  result update
mysql-test/t/rpl_reset_slave.test:
  test for RESET SLAVE and creating twice the same temp table in the slave.
sql/slave.cc:
  when we delete the slave's temp tables (when slave server shuts down and when
  RESET SLAVE), we reset 2 variables: rli->save_temporary_tables & slave_open_temp_tables.