* Disambiguate HTTPUnauthorized on user/password validation
The HA core API usually returns 401 when the request does not
have proper authentication tokens or they have expired.
However the user/password validation endpoint may also return
401 when the given user/password is invalid.
The supervisor is currently unable to distinguish both scenarios,
and it needs to.
See https://github.com/home-assistant/supervisor/issues/2408
* Return 404 if user& password are not found/valid
* Fix test for invalid user/password
905100a189