vdl: adding the copyright header into the generated source code

MultiPart: 1/3
Change-Id: I0b4182b60544a2924119181c854607e16c7fbb20
diff --git a/cmd/vrpc/test_base/test_base.vdl.go b/cmd/vrpc/test_base/test_base.vdl.go
index 8c85aab..944461d 100644
--- a/cmd/vrpc/test_base/test_base.vdl.go
+++ b/cmd/vrpc/test_base/test_base.vdl.go
@@ -1,3 +1,7 @@
+// Copyright 2015 The Vanadium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 // This file was auto-generated by the vanadium vdl tool.
 // Source: test_base.vdl