try to use unversioned keystone endpoints everywhere

Change-Id: Iad2a3654d8ba181a7ad452d8aba872a8313d4ece
diff --git a/lib/placement b/lib/placement
index 4755a58..2c51ed6 100644
--- a/lib/placement
+++ b/lib/placement
@@ -102,7 +102,7 @@
 
 function configure_placement_nova_compute {
     iniset $NOVA_CONF placement auth_type "password"
-    iniset $NOVA_CONF placement auth_url "$KEYSTONE_SERVICE_URI/v3"
+    iniset $NOVA_CONF placement auth_url "$KEYSTONE_SERVICE_URI"
     iniset $NOVA_CONF placement username placement
     iniset $NOVA_CONF placement password "$SERVICE_PASSWORD"
     iniset $NOVA_CONF placement user_domain_name "$SERVICE_DOMAIN_NAME"