Update multivdu VNF descriptor to use ubuntu16.04 image instead of US1604

Update VNF descriptor to use ubuntu16.04 image instead of US1604 and add clout-init to set ubuntu password

hackfest_multivdu_vnf/hackfest_multivdu_vnfd.yaml

@@ -42,6 +42,7 @@ vnfd-catalog:
                 internal-connection-point-ref: mgmtVM-internal
             internal-connection-point:
             -   id: mgmtVM-internal
+            cloud-init-file: cloud-config.txt
         -   id: dataVM
             name: dataVM
             image: ubuntu16.04
@@ -65,4 +66,5 @@ vnfd-catalog:
                 external-connection-point-ref: vnf-data
             internal-connection-point:
             -   id: dataVM-internal
+            cloud-init-file: cloud-config.txt