CORD-2461 Fix loading ONOS netcfg via TOSCA

Change-Id: I7d280518d0d3b1613490412c9945f7f8a68cba9f
diff --git a/templates/fabric-service.yaml.j2 b/templates/fabric-service.yaml.j2
index 77ed898..3d3a155 100644
--- a/templates/fabric-service.yaml.j2
+++ b/templates/fabric-service.yaml.j2
@@ -45,8 +45,8 @@
               node: service#ONOS_Fabric
               relationship: tosca.relationships.BelongsToOne
       properties:
-          name: fabric_network_cfg_json
-          value: {{ fabric_network_cfg_json }}
+          name: rest_onos/v1/network/configuration/
+          value: '{{ fabric_network_cfg_json | to_json }}'
 
     service#fabric:
       type: tosca.nodes.FabricService