Comment 4 for bug 1276985

The periodic_probe_dhcp task uses the API to change this field. It does so by updating the interface and the form to update the interface is shared between the API and the UI. That's the reason why it's present in the UI.

I see two possible course of actions:
- Remove the field from the form. Add a new API call dedicated to upgrading this field. This has the advantage of not including this field in the normal update API call.
- Have two forms: one for the API with the field, one for the UI without the field.