Use MYSQLTEST_VARDIR

mysql-test/t/information_schema.test:
  Use MYSQLTEST_VARDIR instead of MYSQL_TEST_DIR/var

mysql-test/t/information_schema.test

@@ -796,9 +796,9 @@ DROP FUNCTION func2;
 #
 create database mysqltest;
 create table mysqltest.t1(a int);
---exec chmod -r $MYSQL_TEST_DIR/var/master-data/mysqltest
+--exec chmod -r $MYSQLTEST_VARDIR/master-data/mysqltest
 select table_schema from information_schema.tables where table_schema='mysqltest';
---exec chmod +r $MYSQL_TEST_DIR/var/master-data/mysqltest
+--exec chmod +r $MYSQLTEST_VARDIR/master-data/mysqltest
 drop database mysqltest;
 
 #