Merge pull request #183 from vmoravec/allow-service-without-file

Do not check for service unit file | bnc#864934
Files in /etc must be %config/s
Added URL to the source project

- GitHub
Merge pull request #186 from kobliha/fix_build_warnings

Fixed some build warnings
Add systemd service support
Adapt service units and systemctl
Add tests for service and adapt the rest
Convert constant to a method and fix test