Description of problem:

Currently one can do image based provisioning and use a finish script to customize the deploying OR use the combo userdata + cloud-init (or even only userdata).

It would be interesting to have the option to use userdata to do basic configurations (like IP + hostname) and then finish the customization with a finish script.

Easy way to verify that is looking clicking the "resolve" button when creating a host that will be created using an image. If the image is flagged as accepting userdata, only the userdata template will be used.

If the image is not flagged as accepting userdata, then only finish template will be used.

A common use case for this is an environment where no DHCP is used and cloud-init is not desirable to finish the customization.