Add missing "load url from future" in a container template

The modified template uses new syntax for the URL template tag,
but doesn't load the new syntax definition, as required by Django.
This leads to errors when trying to render that template.

Change-Id: I42ddb39cad62b1be0cad81d4758412a981be461e
Closes-bug: #1331271
(cherry picked from commit 8c711e8f6b80bebe9ad49eb6a718b2aba0e2b11b)
Merge branch 'stable/icehouse' of https://github.com/openstack/horizon into stable/icehouse