Remove hosts/host_vars/group_vars and returns None.

        :returns: None

def _remove_vars(self):
        """
        Remove hosts/host_vars/group_vars and returns None.

        :returns: None
        """
        for name in ("hosts", "group_vars", "host_vars"):
            d = os.path.join(self.inventory_directory, name)
            if os.path.islink(d) or os.path.isfile(d):
                os.unlink(d)
            elif os.path.isdir(d):
                shutil.rmtree(d)