Add License headers to all code files

This was related to bug 547
https://osm.etsi.org/bugzilla/show_bug.cgi?id=547

Change-Id: Ief72f6e3b3de828be033729298ae905d163c6988
Signed-off-by: Dominik Fleischmann <dominik.fleischmann@canonical.com>
diff --git a/tests/charms/layers/proxy-ci/actions.yaml b/tests/charms/layers/proxy-ci/actions.yaml
index 5af8591..304b520 100644
--- a/tests/charms/layers/proxy-ci/actions.yaml
+++ b/tests/charms/layers/proxy-ci/actions.yaml
@@ -1,2 +1,16 @@
+# Copyright 2019 Canonical Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+#     Unless required by applicable law or agreed to in writing, software
+#     distributed under the License is distributed on an "AS IS" BASIS,
+#     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#     See the License for the specific language governing permissions and
+#     limitations under the License.
+
 test:
     description: "Verify that the action can run."
diff --git a/tests/charms/layers/proxy-ci/layer.yaml b/tests/charms/layers/proxy-ci/layer.yaml
index 790dee6..186f1db 100644
--- a/tests/charms/layers/proxy-ci/layer.yaml
+++ b/tests/charms/layers/proxy-ci/layer.yaml
@@ -1,3 +1,17 @@
+# Copyright 2019 Canonical Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+#     Unless required by applicable law or agreed to in writing, software
+#     distributed under the License is distributed on an "AS IS" BASIS,
+#     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#     See the License for the specific language governing permissions and
+#     limitations under the License.
+
 includes:
     - 'layer:basic'
     - 'layer:vnfproxy'
diff --git a/tests/charms/layers/proxy-ci/metadata.yaml b/tests/charms/layers/proxy-ci/metadata.yaml
index bb00a03..37120e3 100644
--- a/tests/charms/layers/proxy-ci/metadata.yaml
+++ b/tests/charms/layers/proxy-ci/metadata.yaml
@@ -1,3 +1,17 @@
+# Copyright 2019 Canonical Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+#     Unless required by applicable law or agreed to in writing, software
+#     distributed under the License is distributed on an "AS IS" BASIS,
+#     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#     See the License for the specific language governing permissions and
+#     limitations under the License.
+
 name: proxy-ci
 summary: <Fill in summary here>
 maintainer: Adam Israel <Adam.Israel@ronin>
diff --git a/tests/charms/layers/proxy-ci/reactive/proxy_ci.py b/tests/charms/layers/proxy-ci/reactive/proxy_ci.py
index 9c0136e..cf2ed99 100644
--- a/tests/charms/layers/proxy-ci/reactive/proxy_ci.py
+++ b/tests/charms/layers/proxy-ci/reactive/proxy_ci.py
@@ -1,3 +1,17 @@
+# Copyright 2019 Canonical Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+#     Unless required by applicable law or agreed to in writing, software
+#     distributed under the License is distributed on an "AS IS" BASIS,
+#     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#     See the License for the specific language governing permissions and
+#     limitations under the License.
+
 from charmhelpers.core.hookenv import (
     action_fail,
     action_set,