Xos Auto-scaling app changes (partial)
diff --git a/xos/tosca/samples/helloworld-chain.yaml b/xos/tosca/samples/helloworld-chain.yaml
index c72aa3d..8959f7f 100644
--- a/xos/tosca/samples/helloworld-chain.yaml
+++ b/xos/tosca/samples/helloworld-chain.yaml
@@ -16,6 +16,9 @@
     mysite:
       type: tosca.nodes.Site
 
+    trusty-server-multi-nic:
+      type: tosca.nodes.Image
+
     service_vcpe:
       type: tosca.nodes.Service
       requirements:
@@ -50,6 +53,11 @@
           - site:
               node: mysite
               relationship: tosca.relationships.MemberOfSite
+          - default_image:
+                node: trusty-server-multi-nic
+                relationship: tosca.relationships.DefaultImage
+      properties:
+          default_flavor: m1.small
 
     helloworld_access:
       type: tosca.nodes.network.Network