Fix Port Forwarding reverse url problem due to namespace renaming
in Grizzly version of Horizon.

DHC-952
The namespace for the user dashboard changed from nova to project
making url reversing fail

Change-Id: I35d99389e852b21e62231966a6ad976dc8064364
Signed-off-by: Rosario Di Somma <rosario.disomma@dreamhost.com>