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/fsm.c b/src/fsm.c
index 3f8de9c..827e8b3 100644
--- a/src/fsm.c
+++ b/src/fsm.c
@@ -3,6 +3,8 @@
 /*
  * (C) 2016 by Harald Welte <laforge@gnumonks.org>
  *
+ * 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