authselect migration: use stable interface to query current config
    
    The code currently parses the output of "authselect current" in order
    to extract the current profile and options. Example:
    $ authselect current
    Profile ID: sssd
    Enabled features:
    - with-mkhomedir
    
    It is easier to use the output of "authselect current --raw". Example:
    $ authselect current --raw
    sssd with-mkhomedir
    
    Related to
    https://pagure.io/freeipa/issue/7377
    
    Reviewed-By: Christian Heimes <cheimes@redhat.com>