Fixup debian/copyright to refer to correct license

The package is distributed under the GNU Affero GPL, so the
debian copyright file should refer to the correct license.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Nicholas Bellinger <nab@risingtidesystems.com>
configshell: Change copyright to Apache License 2.0

This patch converts configshell code copyright from AGPL to the
permissive Apache License 2.0.

It also update copyright owner to Datera, Inc.

Signed-off-by: Nicholas Bellinger <nab@risingtidesystems.com>