Wip/ritesh/apertis docker packages

This is just a rebase of sjoerd's work on apertis-docker images. https://gitlab.apertis.org/infrastructure/apertis-docker-images/tree/wip/apertis-package-builder

The work has been tried out in Jenkins playground https://jenkins.apertis.org/job/playground/job/ritesh/job/apertis-18.03/job/packages/ https://jenkins.apertis.org/job/playground/job/sjoerd/job/apertis-18.03/job/packages/