[feature] Allow viewing shared objects by non superadministrators as view only

[nemesifier]

Right now, shared objects (eg: shared templates, shared vpns) are hidden to non superusers.

It would be great to allow non-superusers to see these items in readonly mode.

This change should be done for admin and API views.

[okraits]

This would be very useful!

@nemesisdesign @pandafy So now only the admin integration is missing, right?

[nemesifier]

This would be very useful!

@nemesisdesign @pandafy So now only the admin integration is missing, right?

Yes.