Authenticator<T> for JsonFileAuthenticator to implement home folder

[chelahmy]

Authenticator for JsonFileAuthenticator cannot be implemented by third party because JsonFileAuthenticator.credentials_map is not public. I suggest make it accessible. I have to fork it just for that reason.

I have implemented Authenticator for JsonFileAuthenticator (in my fork) with UserDetail that also implements home(). So, each user will have a home folder. I used the username for the home folder. I should get the user home from the json configuration file instead.

[hannesdejager]

@chelahmy I don't see your fork, can you point me to it? Trying to understand what exactly you are doing.