neutron: use config files from neutron-*aas repos

Now that we split the neutron repository and have service configuration
files maintained in their own repos, start using them.

The old files are going to be cleaned up from the Neutron tree.

Change-Id: Iaeff0b9de88e9bcca87da1092cc888c4cc1bedfd
diff --git a/lib/neutron_plugins/services/firewall b/lib/neutron_plugins/services/firewall
index a1c13ed..61a148e 100644
--- a/lib/neutron_plugins/services/firewall
+++ b/lib/neutron_plugins/services/firewall
@@ -13,7 +13,7 @@
 
 function neutron_fwaas_configure_driver {
     FWAAS_DRIVER_CONF_FILENAME=/etc/neutron/fwaas_driver.ini
-    cp $NEUTRON_DIR/etc/fwaas_driver.ini $FWAAS_DRIVER_CONF_FILENAME
+    cp $NEUTRON_FWAAS_DIR/etc/fwaas_driver.ini $FWAAS_DRIVER_CONF_FILENAME
 
     iniset_multiline $FWAAS_DRIVER_CONF_FILENAME fwaas enabled True
     iniset_multiline $FWAAS_DRIVER_CONF_FILENAME fwaas driver "neutron_fwaas.services.firewall.drivers.linux.iptables_fwaas.IptablesFwaasDriver"