Parameter form readonly

Improve parameter capabilities to display read-only information.

The goal is to:

• Make software type field read only when you cannot edit it
• Support editable/non-editable mode (read only on the form itself).

Most of the work is to support editable parameter across the field and not make a perfect form rendering (this might come with the new editor under work with new API).

Extra:

• Restrict the list of software_type

Requires https://lab.nexedi.com/nexedi/slapos.core/merge_requests/452 to be merged