Copyright for db-defaults source package in Nile V2.0

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/

Files: debian/*
Copyright: Copyright (C) 2008, Clint Adams
           Copyright (C) 2011 Ondřej Surý
License: GPL-3+
 The packaging scripts and files are licensed under the GNU General Public
 License, version 3 or later, found on a Debian system in
 /usr/share/common-licenses/GPL-3