Precondition failed when re-declaring classic queue.

[lukebakken]

Reproduce with the following Python code:

import logging
import pika

logging.basicConfig(level=logging.DEBUG)

with pika.BlockingConnection() as connection:
    channel = connection.channel()
    channel.queue_declare(queue='classic-queue')

with pika.BlockingConnection() as connection:
    channel = connection.channel()
    channel.queue_declare(queue='classic-queue', arguments={'x-queue-type': 'classic'})