Fix issues with lintian job

Several issues have been found when the lintian job has been enabled for golang-github-eclipse-kanto-suite-connector:

• The job did not use the right files, it retrieved then from the main project on OBS and not from the branched project.
• Lintian checked files than are not overridable (.changes, .buildinfo), we only need to check .deb files.

https://phabricator.apertis.org/T8873

Signed-off-by: Dylan Aïssi dylan.aissi@collabora.com