Create Source of Truth file to compare.

def _create_sot_file(self):
        """Create Source of Truth file to compare."""

        # Bug on on NX-OS 6.2.16 where overwriting sot_file would take exceptionally long time
        # (over 12 minutes); so just delete the sot_file
        try:
            self._delete_file(filename="sot_file")
        except Exception:
            pass
        commands = [
            "terminal dont-ask",
            "checkpoint file sot_file",
            "no terminal dont-ask",
        ]
        self._send_command_list(commands)