Fix: resolve 400 HTTP error caused by incorrect example JSON string

Change-Id: Id07a4aa4553ba44d88ffc553d2a03d911f14a2f0
diff --git a/apps/openstacknetworking/app/src/main/resources/definitions/NeutronRouter.json b/apps/openstacknetworking/app/src/main/resources/definitions/NeutronRouter.json
index 47d0f41..27d637a 100644
--- a/apps/openstacknetworking/app/src/main/resources/definitions/NeutronRouter.json
+++ b/apps/openstacknetworking/app/src/main/resources/definitions/NeutronRouter.json
@@ -76,10 +76,12 @@
             "properties": {
               "destination": {
                 "type": "string",
+                "example": "",
                 "description": "The destination CIDR."
               },
               "nexthop": {
                 "type": "string",
+                "example": "",
                 "description": "The IP address of the next hop for the corresponding destination."
               }
             }