Fixed wrong reset of join_cache_level in join_outer*test

mysql-test/main/join_outer.result

@@ -2000,6 +2000,7 @@ INSERT INTO t2 VALUES
 CREATE TABLE t3 ( a int, b int NOT NULL , PRIMARY KEY (b)) ;
 INSERT INTO t3 VALUES 
 (0,6),(0,7),(0,8),(2,9),(0,10),(2,21),(0,22),(2,23),(2,24),(2,25);
+set @save_join_cache_level= @@join_cache_level;
 SET SESSION join_cache_level=4;
 EXPLAIN EXTENDED
 SELECT * FROM (t2 LEFT JOIN t1 ON t1.b = t2.b) JOIN t3 ON t1.b = t3.b;
@@ -2018,7 +2019,7 @@ EXECUTE stmt;
 b	b	a	b
 10	10	0	10
 DEALLOCATE PREPARE stmt;
-SET SESSION join_cache_level=default;
+SET SESSION join_cache_level=@save_join_cache_level;
 DROP TABLE t1,t2,t3;
 #
 # LP bug #943543: LEFT JOIN converted to JOIN with 

mysql-test/main/join_outer.test

@@ -1575,6 +1575,7 @@ CREATE TABLE t3 ( a int, b int NOT NULL , PRIMARY KEY (b)) ;
 INSERT INTO t3 VALUES 
   (0,6),(0,7),(0,8),(2,9),(0,10),(2,21),(0,22),(2,23),(2,24),(2,25);
 
+set @save_join_cache_level= @@join_cache_level;
 SET SESSION join_cache_level=4;
 
 EXPLAIN EXTENDED
@@ -1588,7 +1589,7 @@ EXECUTE stmt;
 
 DEALLOCATE PREPARE stmt;
 
-SET SESSION join_cache_level=default;
+SET SESSION join_cache_level=@save_join_cache_level;
 
 DROP TABLE t1,t2,t3;