Currently when super user login is passed to the UsersManager function accepting a $userLogin parameter, result is not always right.
However results are accurate when the super user token_auth is used.
We should fix implementation so that result is accurate when $userLogin is set to the super user login.
Also we should check that other API methods accepting logins are expected to receive the Super User login.
(In ) - fixes #582 API UsersManager.* accepting $userLogin should work well when super user login is passed