title: Is it possible to move / merge messages between RabbitMQ queues?
body: <p>I'm looking to know is it possible to move / merge messages from one queue to another.
  For example:</p>
  <p><code>main-queue</code> contains messages <code>['cat-1','cat-2','cat-3','cat-4','dog-1','dog-2','cat-5']</code></p>
  <p><code>dog-queue</code> contains messages <code>['dog-1, dog-2, dog-3, dog-4]</code></p>
  <p>So the question is, (assuming both queues are on the same cluster, vhost)  it possible to move messages from <code>dog-queue</code> to <code>main-queue</code> using <code>rabbitmqctl</code> ?</p>
  <p>So at the end I'm looking to get something like:</p>
  <h1>Ideally:</h1>
  <p><code>main-queue</code> : <code>['cat-1','cat-2','cat-3','cat-4','dog-1','dog-2','cat-5', dog-3, dog-4]</code></p>
  <h1>But this is ok too:</h1>
  <p><code>main-queue</code> : <code>['cat-1','cat-2','cat-3','cat-4','dog-1','dog-2','cat-5', 'dog-1, dog-2, dog-3, dog-4]</code></p>