[VOL-2081][VOL-2082] UTs for RO-Core logical_device_manager and model_proxy_manager

Change-Id: I8f5a61e4ec0eff12cabc043383bb47055811cd56
diff --git a/go.mod b/go.mod
index b146eae..55e0ceb 100644
--- a/go.mod
+++ b/go.mod
@@ -8,11 +8,10 @@
 	github.com/golang/protobuf v1.3.2
 	github.com/google/uuid v1.1.1
 	github.com/gyuho/goraph v0.0.0-20160328020532-d460590d53a9
-	github.com/opencord/voltha-lib-go/v2 v2.2.13
 	github.com/mdlayher/ethernet v0.0.0-20190606142754-0394541c37b7 // indirect
+	github.com/opencord/voltha-lib-go/v2 v2.2.13
 	github.com/opencord/voltha-protos/v2 v2.0.1
 	github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2
 	github.com/stretchr/testify v1.4.0
-	google.golang.org/appengine v1.4.0 // indirect
 	google.golang.org/grpc v1.24.0
 )