Port r165 from branches/5.0: Port a change from MySQL:

innodb_cache.test: save and restore query_cache_size

mysql-test/innodb_cache.test

@@ -63,6 +63,7 @@ drop table t1;
 #
 # one statement roll back inside transation
 #
+let $save_query_cache_size=`select @@global.query_cache_size`;
 set GLOBAL query_cache_size=1355776;
 CREATE TABLE t1 ( id int(10) NOT NULL auto_increment, a varchar(25) default NULL, PRIMARY KEY  (id), UNIQUE KEY a (a)) ENGINE=innodb;
 CREATE TABLE t2 ( id int(10) NOT NULL auto_increment, b varchar(25) default NULL, PRIMARY KEY  (id), UNIQUE KEY b (b)) ENGINE=innodb;
@@ -79,5 +80,8 @@ insert into t3 VALUES ( NULL, 1, 1, 2 );
 commit;
 select t1.* from t1, t2, t3 where t3.state & 1 = 0 and t3.t1_id = t1.id and t3.t2_id = t2.id and t1.id = 1 order by t1.a asc;
 drop table t3,t2,t1;
+--disable_query_log
+eval set GLOBAL query_cache_size=$save_query_cache_size;
+--enable_query_log
 
 # End of 4.1 tests