Improve hateoas support to show shared instances.

It turns out that ERP5 returns
```
'form_id': {
  'type': 'StringField',
  'key': 'form_id',
  'default': 'InstanceTree_viewAsHateoas',
},
```
for the `form_id` in hateoas, so adapt the proxy to do the same.

Currently hateoas support in proxy only lists non-shared instances,
so this always says that the instances are not shared.

See merge request nexedi/slapos.core!511

See merge request !514

   Set it non-editable

See merge request !513

See merge request !509

   This script isnt used at all

See merge request nexedi/slapos.core!504

   Strict returns directly a single Software Release for a giving url.

   This fast input option aims to allow certain sites, request "related" slaves
   from an Instance Tree.

   The script  InstanceTree_getFastInputDict is used to custom the feature to
   specific software releases, since depends which one is used, and it cannot
   be generalized for now.

See merge request !505

See merge request nexedi/slapos.core!506

See merge request !508

See merge request nexedi/slapos.core!507

   In this way, the debug becomes easier to be notified.

See merge request !502

The bug was introduced in 57118615 and
was actually removing the main IPv6 of the machine because the
_addSystemAddress function is actually seeing the "tentative" attribute
for the IPv6 address added at boot time.