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: I0da33542af07e461004011e911e0410b48221ab3