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/python/protos/openolt.proto b/python/protos/openolt.proto
index f6c1da1..ba1c4a9 100644
--- a/python/protos/openolt.proto
+++ b/python/protos/openolt.proto
@@ -13,7 +13,7 @@
 // limitations under the License.
 
 syntax = "proto3";
-option go_package = "github.com/opencord/voltha-go/protos/voltha";
+option go_package = "github.com/opencord/voltha-protos/go/voltha";
 
 package voltha;