VOL-1255: Fixed an issue with the proxy implementation

- Had to change the model slightly to mimic a polymorphic behaviour

Change-Id: I12017cdfedf5c0ed05243245aa2a811556222e0f
diff --git a/db/model/root_test.go b/db/model/root_test.go
index 9c57730..68d7f2a 100644
--- a/db/model/root_test.go
+++ b/db/model/root_test.go
@@ -46,7 +46,7 @@
 	afterLoad := time.Now()
 	fmt.Printf(">>>>>>>>>>>>> Time to Load : %f\n", afterLoad.Sub(start).Seconds())
 
-	d := r.Node.Get(deviceProxy, "", 0, false, "")
+	d := r.node.Get(deviceProxy, "", 0, false, "")
 	afterGet := time.Now()
 	fmt.Printf(">>>>>>>>>>>>> Time to Load and get: %f\n", afterGet.Sub(start).Seconds())