Login the user on the session prompting for passwords interactively when necessary.
This call will return immediately and completes asynchronously.
this |
session to use for login |
user_type |
the type of login user |
interaction |
interaction to request PIN when necessary |
cancellable |
optional cancellation object, or |
callback |
called when the operation completes |
user_data |
data to pass to the callback |