Prints a dictionary that has variable => value mappings.

def _print_map_dict(self, argkey, filename, append):
        """Prints a dictionary that has variable => value mappings."""
        result = []
        skeys = list(sorted(self.curargs[argkey].keys()))
        for key in skeys:
            result.append("'{}' => {}".format(key, self.curargs[argkey][key]))
        self._redirect_output('\n'.join(result), filename, append, msg.info)