title: azure service bus queue with multiple listeners / competing consumers with queue
body: <p>Theoretically it looks like azure service bus queues is one to one with respect to message and receiver.
  Just wanted to know if it's possible to have more than one listeners to a queue.</p>
  
  <p>If it is 1:1, does it mean to realize competing consumers pattern we cannot use queues, and topics is the only option?</p>