Prepare for dropping keystone admin endpoint

Keystone no longer has any special functionality hidden behind the admin
endpoint. Stop referencing it in consumers, so it can later be dropped
completely.

Change-Id: I04a5d77908005268cc7c59e7e9ddeea70f6732e2
diff --git a/lib/neutron-legacy b/lib/neutron-legacy
index bb1536a..5e4251f 100644
--- a/lib/neutron-legacy
+++ b/lib/neutron-legacy
@@ -372,7 +372,7 @@
 function create_nova_conf_neutron {
     local conf=${1:-$NOVA_CONF}
     iniset $conf neutron auth_type "password"
-    iniset $conf neutron auth_url "$KEYSTONE_AUTH_URI"
+    iniset $conf neutron auth_url "$KEYSTONE_SERVICE_URI"
     iniset $conf neutron username "$Q_ADMIN_USERNAME"
     iniset $conf neutron password "$SERVICE_PASSWORD"
     iniset $conf neutron user_domain_name "$SERVICE_DOMAIN_NAME"