fix yadis session handling when using memcache session handler

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@892 44740490-163a-0410-bde0-09ae8108e29a

modules/openid/www/consumer.php

@@ -5,6 +5,8 @@ require_once('Auth/OpenID/SReg.php');
 require_once('Auth/OpenID/Server.php');
 require_once('Auth/OpenID/ServerRequest.php');
 
+session_start();
+
 $config = SimpleSAML_Configuration::getInstance();
 
 /* Find the authentication state. */