VOL-1460 Updated core to use voltha-protos instead of local protos
Moved protos to python directory in order to maintain functionaly of containers built there.
Added capability to do local builds of protos
Added instructions on running dep ensure for getting protos.
Updated github.com/golang/protobuf version to v1.3.1

Change-Id: Ia6ef55f07f0d5dcb5b750d7c37b21b71db85bfc4
diff --git a/vendor/google.golang.org/grpc/naming/naming.go b/vendor/google.golang.org/grpc/naming/naming.go
index 8cc39e9..c99fdbe 100644
--- a/vendor/google.golang.org/grpc/naming/naming.go
+++ b/vendor/google.golang.org/grpc/naming/naming.go
@@ -17,7 +17,7 @@
  */
 
 // Package naming defines the naming API and related data structures for gRPC.
-// The interface is EXPERIMENTAL and may be suject to change.
+// The interface is EXPERIMENTAL and may be subject to change.
 //
 // Deprecated: please use package resolver.
 package naming