title: how to get list of service buses in a subscription or RG
body: <p>I am trying to use</p>
  <pre><code>var adminClient = new ServiceBusAdministrationClient(
  </code></pre>
  <p>to fetch some topics related data.</p>
  <p>I see that ServiceBusAdministrationClient can be used for one SB. Is there a way to get a list of SBs in an Azure subscription or Resource Group so I can loop on it and do the same thing.</p>