use correct/updated backend data key

inventory_provider/routes/data.py

@@ -59,7 +59,7 @@ def router_interfaces(hostname):
     r = redis.StrictRedis(
         host=redis_config["hostname"],
         port=redis_config["port"])
-    ifc_data_string = r.hget(hostname, 'interfaces')
+    ifc_data_string = r.hget(hostname, 'snmp-interfaces')
     if not ifc_data_string:
         return Response(
             response="no available info for '%s'" % hostname,