add VOLTTenant to tosca, relationships to connect VOLT to Subscriber, and update cord sample
diff --git a/xos/tosca/samples/cord.yaml b/xos/tosca/samples/cord.yaml
index d1a2af5..eaa536a 100644
--- a/xos/tosca/samples/cord.yaml
+++ b/xos/tosca/samples/cord.yaml
@@ -75,6 +75,7 @@
     My House:
        type: tosca.nodes.CORDSubscriber
        properties:
+           service_specific_id: 1234
            firewall_enable: true
            cdn_enable: true
            url_filter_enable: true
@@ -120,3 +121,17 @@
                node: My House
                relationship: tosca.relationships.SubscriberDevice
 
+    My Volt:
+        type: tosca.nodes.VOLTTenant
+        properties:
+            service_specific_id: 1234
+        requirements:
+            - provider_service:
+                node: service_volt
+                relationship: tosca.relationships.MemberOfService
+            - subscriber:
+                node: My House
+                relationship: tosca.relationships.BelongsToSubscriber
+
+
+