Fix session handling issue (fatal error)

This ticket is a copy of a ticket for the legal module (which has the same problem) #834962: Fix session handling issue

---

A side effect of calling session_destroy() in PHP 5.2.X or below is that all the user-defined session save handlers set for the session are also destroyed.

This causes the following error:

Fatal error: session_start() [function.session-start]: Failed to initialize storage module: user (path: /var/lib/php5) in /var/WWW/drupal/includes/bootstrap.inc on line 1676

This is especially problematic under Pressflow with the way they handle cookies.

The attached patch re-initializes the session save handlers after calling session_destroy().

Further reading : https://bugs.edge.launchpad.net/pressflow/+bug/513117 http://bugs.php.net/bug.php?id=32330