[VOL-4290] Voltha go library updates for gRPC migration

Change-Id: I1aa2774beb6b7ed7419bc45aeb53fcae8a8ecda0
diff --git a/vendor/github.com/grpc-ecosystem/grpc-gateway/runtime/mux.go b/vendor/github.com/grpc-ecosystem/grpc-gateway/runtime/mux.go
index 1da3a58..523a9cb 100644
--- a/vendor/github.com/grpc-ecosystem/grpc-gateway/runtime/mux.go
+++ b/vendor/github.com/grpc-ecosystem/grpc-gateway/runtime/mux.go
@@ -55,6 +55,15 @@
 	}
 }
 
+// SetQueryParameterParser sets the query parameter parser, used to populate message from query parameters.
+// Configuring this will mean the generated swagger output is no longer correct, and it should be
+// done with careful consideration.
+func SetQueryParameterParser(queryParameterParser QueryParameterParser) ServeMuxOption {
+	return func(serveMux *ServeMux) {
+		currentQueryParser = queryParameterParser
+	}
+}
+
 // HeaderMatcherFunc checks whether a header key should be forwarded to/from gRPC context.
 type HeaderMatcherFunc func(string) (string, bool)
 
@@ -102,11 +111,11 @@
 	}
 }
 
-// WithProtoErrorHandler returns a ServeMuxOption for passing metadata to a gRPC context.
+// WithProtoErrorHandler returns a ServeMuxOption for configuring a custom error handler.
 //
 // This can be used to handle an error as general proto message defined by gRPC.
-// The response including body and status is not backward compatible with the default error handler.
-// When this option is used, HTTPError and OtherErrorHandler are overwritten on initialization.
+// When this option is used, the mux uses the configured error handler instead of HTTPError and
+// OtherErrorHandler.
 func WithProtoErrorHandler(fn ProtoErrorHandlerFunc) ServeMuxOption {
 	return func(serveMux *ServeMux) {
 		serveMux.protoErrorHandler = fn
@@ -156,18 +165,6 @@
 		opt(serveMux)
 	}
 
-	if serveMux.protoErrorHandler != nil {
-		HTTPError = serveMux.protoErrorHandler
-		// OtherErrorHandler is no longer used when protoErrorHandler is set.
-		// Overwritten by a special error handler to return Unknown.
-		OtherErrorHandler = func(w http.ResponseWriter, r *http.Request, _ string, _ int) {
-			ctx := context.Background()
-			_, outboundMarshaler := MarshalerForRequest(serveMux, r)
-			sterr := status.Error(codes.Unknown, "unexpected use of OtherErrorHandler")
-			serveMux.protoErrorHandler(ctx, serveMux, outboundMarshaler, w, r, sterr)
-		}
-	}
-
 	if serveMux.incomingHeaderMatcher == nil {
 		serveMux.incomingHeaderMatcher = DefaultHeaderMatcher
 	}