[CORD-2276]
Update to work with newer versions of Shade OpenStack lib

Change-Id: I4521f24fdbd31b27c93db73016dbd09c6753f2ac
diff --git a/xos/synchronizer/steps/sync_instances.yaml b/xos/synchronizer/steps/sync_instances.yaml
index be8b81e..8557ac1 100644
--- a/xos/synchronizer/steps/sync_instances.yaml
+++ b/xos/synchronizer/steps/sync_instances.yaml
@@ -1,4 +1,4 @@
-
+---
 # Copyright 2017-present Open Networking Foundation
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -13,11 +13,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-
----
 - hosts: 127.0.0.1
   connection: local
   tasks:
+
   - os_server:
       name: "{{ name }}"
       auth:
@@ -25,6 +24,7 @@
         username: "{{ admin_user }}"
         password: "{{ admin_password }}"
         project_name: "{{ project_name }}"
+      interface: "admin"
       {% if delete -%}
       state: absent
       {% else -%}