title: Consul API, Retrieve services instances list from all nodes
body: <p>I've explored service catalog, all I can see are the actual Service names, but not each service instance.
  for e.g using Consul API/CLI,
  I can only see Service-A,
  But I prefer to see all instances under it.</p>
  <ul>
  <li>Service-A-abc</li>
  <li>Service-A-xyz</li>
  <li>Service-A-123</li>
  </ul>
  <p>How can I get the all services instances from all nodes together?</p>