Add __traceback_info__ to response.redirect()

Reason:

  ValueError: Untrusted redirect to host 'localhost:8080' not allowed.

does not give enough information to see where the app tried to redirect
us.

src/zope/publisher/http.py

@@ -957,6 +957,8 @@ def redirect(self, location, status=None, trusted=False):
         # convertable to string, for example, an URLGetter instance
         location = str(location)
 
+        __traceback_info__ = location
+
         if not trusted:
             target_host = extract_host(location)
             if target_host: