Sponsosr can now click a button next to passport/fnr values on the
guest info page to see the source and verifier of the value.

Resolves: GREG-275

Move serializers only used by gregui.

Andreas Ellewsen authored 3 years ago and Jonas Braathen committed 3 years ago

If a sponsor verifies a nin that is already in use by an account in
cerebrum, the guest will gain access to that account, which in turn
allows the guest to change the password of that account. This makes it
possible to abuse the guest service to steal the account of users.

A feature that checks for this problem, and helps the sponsor make a
decision on it, will be introduced in the near future. At that point
nin verification can be enabled again.

Resolves: GREG-202