CORD-2964 Tosca changes for OpenStack Modeling Changes;
Enable Pull Steps and Models directories;
Add OpenStack synchronizer to filter-images

Change-Id: I324afbcf542ba907decb9b0907dc18354be61249
diff --git a/examples/filter-images.yaml b/examples/filter-images.yaml
index 9c9adbe..43bd5e4 100644
--- a/examples/filter-images.yaml
+++ b/examples/filter-images.yaml
@@ -26,6 +26,7 @@
 - xosproject/xos-tosca
 - xosproject/xos-ws
 - xosproject/xos-synchronizer-base
+- xosproject/openstack-synchronizer
 - xosproject/rcord-synchronizer
 - xosproject/volt-synchronizer
 - xosproject/vrouter-synchronizer