This commit is the result of the squash of the following main commits:

Author: Eric Bollengier <eric@baculasystems.com>
Date:   Tue Jul 21 10:28:13 2020 +0200

    regress: Add copyright to regress scripts

Author: Eric Bollengier <eric@baculasystems.com>
Date:   Thu Mar 28 17:49:02 2019 +0100

    regress: Add test to check fileset option keywords