[RFE] We might can drop all `systemctl enable cloud-init` lines

Created by: shibumi

Is your feature request related to a problem? Please describe. Right now we enable four cloud-init services manually. Cloud-init comes with a default cloud-init-generator placed in usr/lib/systemd/system-generators/cloud-init-generator. Therefore systemd will make sure to trigger cloud-init when we have a datasource.

Describe the solution you'd like Just remove all systemctl enable cloud-init* lines in our cloud-init.sh file.

This needs proper testing!