debian/changelog: cleanup

Change-Id: I721c56a3419dda21f8fc70ebb37aa1c2cfc2e3ff
utils: if src == dest, return nil when cp file

Change-Id: Ibad4f01f33e814f19bcf2b6ac745eedfb2934209
tower: https://tower.im/projects/69dc94f2e66248d5b722b7d9609b8fe7/todos/111d7b3501bb454884635752ae5f396d/