rewritten test using loop (BUG#930)

removed unused field (now it is in variables)


mysql-test/r/query_cache.result:
  rewritten test using loop
mysql-test/t/query_cache.test:
  rewritten test using loop
sql/sql_class.h:
  removed unused field (now it is in variables)

sql/sql_class.h

@@ -452,7 +452,6 @@ public:
   /* variables.transaction_isolation is reset to this after each commit */
   enum_tx_isolation session_tx_isolation;
   char	     scramble[9];
-  uint8	     query_cache_type;		// type of query cache processing
   bool       slave_thread;
   bool	     set_query_id,locked,count_cuted_fields,some_tables_deleted;
   bool	     no_errors, allow_sum_func, password, fatal_error;