65145c5 Do not use Python slip package

Authored and Committed by plautrba 2 years ago
    Do not use Python slip package
    
    It's not maintained anymore and it allows us to drop dependency on
    Python slip package
    
    Use DBUS polkit interface instead -
    https://www.freedesktop.org/software/polkit/docs/latest/eggdbus-interface-org.freedesktop.PolicyKit1.Authority.html