[bug 1365523] Don't generate sessions on '/'
[bug 1365523] Don't generate sessions on '/'

The datetimeformat helper is storing 'timezone' in user session for all users.
We're using datetimeformat on '/' only to display the year part in the copyright
notice where it's safe to ignore timezone information.

mozilla/kitsune,anushbmx/kitsune,anushbmx/kitsune,safwanrahman/kitsune,mozilla/kitsune,MikkCZ/kitsune,MikkCZ/kitsune,MikkCZ/kitsune,mozilla/kitsune,anushbmx/kitsune,safwanrahman/kitsune,anushbmx/kitsune,safwanrahman/kitsune,MikkCZ/kitsune,mozilla/kitsune,safwanrahman/kitsune