VOL-1460 Implemented a new approach to protos where go stubs are not committed to the repo.
There are new instructions for clients consuming these protos in Go.
Also removed vendor directory and dep, as it isn't really needed at this point.

Implemented a test to check if protos match up with go files. This is run with make test.
This works by generating them and checking this created any more untracked or unstaged changes.
It requires you to commit your changes locally to pass. This process to should be run by
jenkins to validate a commit. A consistent version of protoc must be used, which the Makefile checks for.

Change-Id: I8de28c515a9535e33909cbbd158fa046f96f3b1f
diff --git a/protos/voltha_protos/ietf_interfaces.proto b/protos/voltha_protos/ietf_interfaces.proto
index d43c02d..90e489b 100644
--- a/protos/voltha_protos/ietf_interfaces.proto
+++ b/protos/voltha_protos/ietf_interfaces.proto
@@ -1,6 +1,6 @@
 syntax = "proto3";
 
-option go_package = "github.com/opencord/voltha-go/protos/ietf";
+option go_package = "github.com/opencord/voltha-protos/go/ietf";
 
 package ietf_interfaces;