Support for profiles that don't provide network.target

There are use cases for connections that don't provide any useful functionality  in the network.target. So there is Patch for adding support to choose it based on the generated netctl-profile systemd-unit.


Open Issues:
- [ ] Existing, generated `netctl@.service` files don't provide network.target after updating to a version containing this merge request 


Any idea how to deal with it or fixing it in a clever way?