We don't update the polkit file normally, for now let's check if  it's
installed. It should be more clever, detecting wich file is needed,
depending on wich bitmask-root will be executed. But for now it's just a
dummy check.

polkit doesn't work inside docker.

Since bonafide was not catching the error 401, an attempt to bootstrap a
provider that does not support anonvpn with the new setup was resulting
in a json that was containing only an error message.

this was producing an error when trying to access the configuration for
that provider's EIP section.

we now avoid writing a json config file if an error 401 is found, and
also catch the exception for a ValueError when the EIP section is not
found in the provider's configuration.