vendor: add github.com/goftp/server

vendor/github.com/goftp/server/fileinfo.go

@@ -0,0 +1,14 @@
+// Copyright 2018 The goftp Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package server
+
+import "os"
+
+type FileInfo interface {
+	os.FileInfo
+
+	Owner() string
+	Group() string
+}