fix test when session.save_handler is "user"

Zend/tests/unset_cv05.phpt

@@ -2,6 +2,8 @@
 unset() CV 5 (indirect unset() of global variable in session_start())
 --INI--
 register_long_arrays=1
+session.auto_start=0
+session.save_handler=files
 --SKIPIF--
 <?php 
 

Zend/tests/unset_cv06.phpt

@@ -4,6 +4,8 @@ unset() CV 6 (indirect unset() of global variable in session_unset())
 <?php include(dirname(__FILE__).'/../../ext/session/tests/skipif.inc'); ?>
 --INI--
 register_globals=1
+session.auto_start=0
+session.save_handler=files
 --FILE--
 <?php
 $x = "1\n";