tree-wide: add python file copyright headers

And update a couple.

Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>

src/west/version.py

@@ -1,3 +1,5 @@
+# Copyright (c) 2019, Nordic Semiconductor ASA
+#
 # Don't put anything else in here!
 #
 # This is the Python 3 version of option 3 in:

tests/conftest.py

@@ -1,4 +1,4 @@
-# Copyright (c) 2019, Nordic Semiconductor ASA
+# Copyright (c) 2019, 2020 Nordic Semiconductor ASA
 #
 # SPDX-License-Identifier: Apache-2.0
 

tests/test_help.py

@@ -1,3 +1,5 @@
+# Copyright (c) 2020, Nordic Semiconductor ASA
+
 import itertools
 
 import os

tests/test_manifest.py

@@ -1,4 +1,5 @@
 # Copyright 2018 Foundries.io Ltd
+# Copyright (c) 2020, Nordic Semiconductor ASA
 #
 # SPDX-License-Identifier: Apache-2.0
 

tests/test_project.py

@@ -1,3 +1,5 @@
+# Copyright (c) 2020, Nordic Semiconductor ASA
+
 import collections
 import os
 import re