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Fixes lintian: copyright-does-not-refer-to-common-license-file
See https://lintian.debian.org/tags/copyright-does-not-refer-to-common-license-file.html for more details.

Fixes lintian: tab-in-licence-text
See https://lintian.debian.org/tags/tab-in-licence-text.html for more details.

Policy upgrading checklist:
 https://www.debian.org/doc/debian-policy/upgrading-checklist.html#version-4-3-0



Changes are:
 * use proper verbose mode
 * refresh URLs in d/copyright
Signed-off-by: Arturo Borrero Gonzalez <arturo@debian.org>

Let's update the copyright file with latest file additions regarding nftables.
Also, small tiny fixes reported by lintian.
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>