Change the translation from our internal structs to the structs used for
weldr serialization to drop account details. These must obviously be
passed in to configure an upload, but exposing them in the logs may be
surprising.
There is no notion of user accounts in the weldr API, and the state
should not be considered private. However, this is likely to take people
by surprise, so let us guard the secrets entrusted to us.
Fixes#907.
Signed-off-by: Tom Gundersen <teg@jklm.no>