update copyright date

- add "alone" files in update-copyright tool
- make a pass of this last tool to fix dates

Change-Id: I1f276a132c0d5468b81400bbb50889e80823f45c
Signed-off-by: Guillaume Roguez <guillaume.roguez@savoirfairelinux.com>
Reviewed-by: Stepan Salenikovich <stepan.salenikovich@savoirfairelinux.com>