'Execute output_show for specified \'output_key\'.
This method uses old way for getting output value.
It gets whole stack object and then finds necessary \'output_key\'.
:param stack: stack with output_key output.
:param output_key: The name of the output.'

@atomic.action_timer('heat.show_output_old')
def _stack_show_output_old(self, stack, output_key):

    stack = self.clients('heat').stacks.get(stack_id=stack.id)
    for output in stack.to_dict().get('outputs', []):
        if (output['output_key'] == output_key):
            break
