As of right now, we are allowing SSH ECDSA and ed25519 keys to be used
in the Fedora Account System.
However, I would *strongly* suggest infrastructure team members to
*not* use either of those, because that would prevent you from
accessing any of the remaining RHEL6 machines we still have.
The reason this has been changed now is because we shut off hosted03,
which was the final server that non-infra folks have SSH access to.