Comment 2 for bug 1453678

General observation across all three charms - its not really required to add copyright headers to all files; a copyright file should be provided for each charm which can detail copyright for individual files if required:

  http://bazaar.launchpad.net/~openstack-charmers/charms/trusty/neutron-gateway/next/view/head:/copyright

This is a machine readable format used across Debian and Ubuntu.