Changes to support ofp_error_message with xid

Change-Id: Ic6f66628b1da43785564939db6968fb01e12654e
diff --git a/go/voltha/voltha.pb.go b/go/voltha/voltha.pb.go
index 217adcf..2ec3452 100644
--- a/go/voltha/voltha.pb.go
+++ b/go/voltha/voltha.pb.go
@@ -503,6 +503,7 @@
 // ChangeEvent from public import voltha_protos/openflow_13.proto
 type ChangeEvent = openflow_13.ChangeEvent
 type ChangeEvent_PortStatus = openflow_13.ChangeEvent_PortStatus
+type ChangeEvent_Error = openflow_13.ChangeEvent_Error
 
 // OfpPortNo from public import voltha_protos/openflow_13.proto
 type OfpPortNo = openflow_13.OfpPortNo