VOL-1643 Update voltha-lib-go to use voltha-protos v3.0.0

and bump up the version to 3.0.0. voltha-protos is modified to be
compatible with the java language proto compilation. It's a major
change and a major version change has been made.

Change-Id: Ifb93430567ddf96aaa0fbf6e5853aad9e1070f6f
diff --git a/Makefile b/Makefile
index 5edab32..971119f 100644
--- a/Makefile
+++ b/Makefile
@@ -50,8 +50,8 @@
 	@mkdir -p python/local_imports
 ifdef LOCAL_PROTOS
 	rm -rf vendor/github.com/opencord/voltha-protos
-	mkdir -p vendor/github.com/opencord/voltha-protos/v2/go
-	cp -r ${LOCAL_PROTOS}/go/* vendor/github.com/opencord/voltha-protos/v2/go
+	mkdir -p vendor/github.com/opencord/voltha-protos/v3/go
+	cp -r ${LOCAL_PROTOS}/go/* vendor/github.com/opencord/voltha-protos/v3/go
 	rm -rf python/local_imports/voltha-protos
 	mkdir -p python/local_imports/voltha-protos/dist
 	cp ${LOCAL_PROTOS}/dist/*.tar.gz python/local_imports/voltha-protos/dist/