remove no longer provided nonce, timestamp and auth_token
logging: UserDoesNotExist is not necessarily an error
Revert "Remove auth_token generation from one more place."

I didn't remember correctly how the signup -> dashboard wizard works.

This reverts commit 40e4e77c387adf70f767b8f62353eb0693f2d27e.
Revert "remove no longer provided nonce, timestamp and auth_token"

I didn't remember correctly how the signup -> dashboard wizard works.

This reverts commit d669cf55b9f656de65b5ec132dad5c23c7597b38.
Move eduPersonPrincipalName generation.

Hopefully to the place where new users are really created.