CORD-3225 fix m-cord profile validation issues

Change-Id: Ia15599b4176596cee89f18041c84a2109bf41633
diff --git a/xos-profiles/base-openstack/templates/_tosca.tpl b/xos-profiles/base-openstack/templates/_tosca.tpl
index 28ec7de..6ffeedb 100644
--- a/xos-profiles/base-openstack/templates/_tosca.tpl
+++ b/xos-profiles/base-openstack/templates/_tosca.tpl
@@ -111,7 +111,7 @@
     service_dependency#onos-cord_vtn:
       type: tosca.nodes.ServiceDependency
       properties:
-        connect_method: None
+        connect_method: none
       requirements:
         - subscriber_service:
             node: service#ONOS_CORD