Fix/Update copyright notices; Add SPDX annotation

Let's fix some erroneous/accidential references to wrong license,
update copyright information where applicable and introduce a
SPDX-License-Identifier to all files.

Change-Id: I39af26c6aaaf5c926966391f6565fc5936be21af
diff --git a/src/vty/utils.c b/src/vty/utils.c
index e7aeb88..8cd0b35 100644
--- a/src/vty/utils.c
+++ b/src/vty/utils.c
@@ -2,9 +2,12 @@
  * Utility routines for printing common objects in the Osmocom world. */
 /*
  * (C) 2009-2010 by Harald Welte <laforge@gnumonks.org>
+ * (C) 2013,2015 by sysmocom - s.f.m.c. GmbH
  *
  * All Rights Reserved
  *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or