when we close the session's temp tables at session end, we automatically write to binlog *one* DROP TEMPORARY TABLE *per tmp table*.


mysql-test/r/drop_temp_table.result:
  result update (note: one DROP TEMPORARY TABLE per tmp table)
mysql-test/t/drop_temp_table.test:
  checking that we have one DROP TEMPORARY TABLE per tmp table now, not one multi-table DROP.
  Hiding columns Log_pos/End_log_pos per Monty's request.
sql/sql_base.cc:
  When we close the session's temp tables at session end, we automatically write to binlog one DROP TEMPORARY TABLE per tmp table, 
  not one single multi-table DROP TEMPORARY TABLE (because it causes problems if slave has --replicate*table rules).