Updated openstack/openstack
Project: openstack/horizon  a63569afdc09a8d410f2fbb24f9fa80de60ac532

Defining missing failure_url

failure_url is used to redirect on an API call failure, however it is
never defined. Adding that definition.

Closes-Bug: #1393579
Change-Id: If0f610ece31624f5ae3ad9ba092594232b81a02a