As per OpenStack licensing guide lines [1]:
[H102 H103] Newly contributed Source Code should be licensed under
the Apache 2.0 license.
[H104] Files with no code shouldn't contain any license header nor
comments, and must be left completely empty.
[1] http://docs.openstack.org/developer/hacking/#openstack-licensing
Change-Id: I0efe587768fa1b8f1b6fc64ecfb56a2e57ebd9a9