add docker_image_name attribute to VSGService

Change-Id: I27cd9ffd4629823f0f9cfe17c70038c2122929fc
diff --git a/xos/models.py b/xos/models.py
index ad25c98..96fb71a 100644
--- a/xos/models.py
+++ b/xos/models.py
@@ -36,7 +36,9 @@
                           ("backend_network_label", "hpc_client"),
                           ("dns_servers", "8.8.8.8"),
                           ("url_filter_kind", None),
-                          ("node_label", None) )
+                          ("node_label", None),
+                          ("docker_image_name", "docker.io/xosproject/vsg"),
+                          ("docker_insecure_registry", False) )
 
     def __init__(self, *args, **kwargs):
         super(VSGService, self).__init__(*args, **kwargs)