cosmetic: Update copyright statement, license notice and SPDX

Some of our files didn't have a copyright notice at all, let's add
it.  Also, update the notices in other files and ensure a SPDX
identifier is present in all but the most trivial files.

Change-Id: If7fa19ce484b415bc645e39b3d0d666b44b5f0fd
diff --git a/bsc-nat/BSCNAT_Tests.ttcn b/bsc-nat/BSCNAT_Tests.ttcn
index 993d668..b9b031f 100644
--- a/bsc-nat/BSCNAT_Tests.ttcn
+++ b/bsc-nat/BSCNAT_Tests.ttcn
@@ -1,5 +1,16 @@
 module BSCNAT_Tests {
 
+/* osmo-bsc_nat test suite in TTCN-3
+ * (C) 2018-2019 sysmocom - s.f.m.c. GmbH
+ * Author: Daniel Willmann
+ * All rights reserved.
+ *
+ * Released under the terms of GNU General Public License, Version 2 or
+ * (at your option) any later version.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
 import from Osmocom_Types all;
 
 import from IPL4asp_Types all;
diff --git a/bsc-nat/BSC_MS_ConnectionHandler.ttcn b/bsc-nat/BSC_MS_ConnectionHandler.ttcn
index 28ff349..7777f03 100644
--- a/bsc-nat/BSC_MS_ConnectionHandler.ttcn
+++ b/bsc-nat/BSC_MS_ConnectionHandler.ttcn
@@ -1,5 +1,14 @@
 module BSC_MS_ConnectionHandler {
 
+/* (C) 2017-2019 Harald Welte <laforge@gnumonks.org>
+ * All rights reserved.
+ *
+ * Released under the terms of GNU General Public License, Version 2 or
+ * (at your option) any later version.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
 import from General_Types all;
 import from Osmocom_Types all;
 import from SCCPasp_Types all;
diff --git a/bsc-nat/BSC_MS_Simulation.ttcn b/bsc-nat/BSC_MS_Simulation.ttcn
index c45b5ac..ed6e92d 100644
--- a/bsc-nat/BSC_MS_Simulation.ttcn
+++ b/bsc-nat/BSC_MS_Simulation.ttcn
@@ -1,5 +1,15 @@
 module BSC_MS_Simulation {
 
+/* (C) 2017-2018 Harald Welte <laforge@gnumonks.org>
+ * (C) 2018 sysmocom - s.f.m.c. Gmbh; Author: Daniel Willmann
+ * All rights reserved.
+ *
+ * Released under the terms of GNU General Public License, Version 2 or
+ * (at your option) any later version.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
 import from IPL4asp_Types all;
 
 import from IPA_Emulation all;
diff --git a/bsc-nat/MGCP_Adapter.ttcn b/bsc-nat/MGCP_Adapter.ttcn
index 6491c68..478c688 100644
--- a/bsc-nat/MGCP_Adapter.ttcn
+++ b/bsc-nat/MGCP_Adapter.ttcn
@@ -1,5 +1,15 @@
 module MGCP_Adapter {
 
+/* MGCP Adapter for bsc-nat tests in TTCN-3
+ * (C) 2017 Harald Welte <laforge@gnumonks.org>
+ * All rights reserved.
+ *
+ * Released under the terms of GNU General Public License, Version 2 or
+ * (at your option) any later version.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
 import from IPL4asp_Types all;
 
 import from MGCP_Types all;
diff --git a/bsc-nat/MSC_ConnectionHandler.ttcn b/bsc-nat/MSC_ConnectionHandler.ttcn
index 36fdf85..89728b4 100644
--- a/bsc-nat/MSC_ConnectionHandler.ttcn
+++ b/bsc-nat/MSC_ConnectionHandler.ttcn
@@ -1,5 +1,14 @@
 module MSC_ConnectionHandler {
 
+/* (C) 2017-2019 Harald Welte <laforge@gnumonks.org>
+ * All rights reserved.
+ *
+ * Released under the terms of GNU General Public License, Version 2 or
+ * (at your option) any later version.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
 import from General_Types all;
 import from Osmocom_Types all;
 import from SCCPasp_Types all;