Updating to latest protos and device-management interface, releasing 2.0

Change-Id: I2d2ebf5b305d6d06b8d01c49d4d67e7ff050f5d4
diff --git a/vendor/github.com/stretchr/testify/LICENSE b/vendor/github.com/stretchr/testify/LICENSE
index f38ec59..4b0421c 100644
--- a/vendor/github.com/stretchr/testify/LICENSE
+++ b/vendor/github.com/stretchr/testify/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2012-2018 Mat Ryer and Tyler Bunnell
+Copyright (c) 2012-2020 Mat Ryer, Tyler Bunnell and contributors.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal