Make configure_neutron_nova_new and create_nova_conf_neutron param optional

The commit e95f2a3 broke
networking-ovn (and potentially other ml2 drivers) by making the config
parameter mandatory. It doesn't need to be.

Change-Id: I0d5738ac3a6d27ddb7655835d77689409a6ff6f4

Author: umago

lib/neutron

@@ -325,9 +325,10 @@ function configure_neutron_rootwrap {
 }
 
 # Make Neutron-required changes to nova.conf
-# Takes a single argument which is the config file to update.
+# Takes a single optional argument which is the config file to update,
+# if not passed $NOVA_CONF is used.
 function configure_neutron_nova_new {
-    local conf="$1"
+    local conf=${1:-$NOVA_CONF}
     iniset $conf DEFAULT use_neutron True
     iniset $conf neutron auth_type "password"
     iniset $conf neutron auth_url "$KEYSTONE_SERVICE_URI"

lib/neutron-legacy

@@ -366,7 +366,7 @@ function configure_mutnauq {
 }
 
 function create_nova_conf_neutron {
-    local conf="$1"
+    local conf=${1:-$NOVA_CONF}
     iniset $conf DEFAULT use_neutron True
     iniset $conf neutron auth_type "password"
     iniset $conf neutron auth_url "$KEYSTONE_AUTH_URI"