Fix Firewall Rules 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: I085d9ab59402e83f5f918daf1585551bb30c6c4d
Signed-off-by: Rosario Di Somma <rosario.disomma@dreamhost.com>