Convert row range object to dict which can be passed to
        google.bigtable.v2.RowRange add method.

def get_range_kwargs(self):
        """ Convert row range object to dict which can be passed to
        google.bigtable.v2.RowRange add method.
        """
        range_kwargs = {}
        if self.start_key is not None:
            start_key_key = "start_key_open"
            if self.start_inclusive:
                start_key_key = "start_key_closed"
            range_kwargs[start_key_key] = _to_bytes(self.start_key)

        if self.end_key is not None:
            end_key_key = "end_key_open"
            if self.end_inclusive:
                end_key_key = "end_key_closed"
            range_kwargs[end_key_key] = _to_bytes(self.end_key)
        return range_kwargs