This getUserFolderPath method returns the node path where the user should be created:
String getUserFolderPath(String userId,
String clientId,
Map<String,Object> props)Return the node path where the user should be created
Parameters: userId - clientId - in use when creating this user props - map of all provider's properties for this user Returns: relative path to store this user within /home/users (e.g. "facebook/1234" might be appropriate for facebook user with id=12345678)