title: Command executed with Paramiko does not produce any output
body: <p>When I try to do</p>
  <pre><code>stdin, stdout, stderr = client1.exec_command('glass-version')
  print stdout.readlines()
  </code></pre>
  <p>I am getting an empty output.</p>
  <hr />
  <p>An expected output is:</p>
  <pre class="lang-none prettyprint-override"><code>===================== GLASS version details =====================
   GLASS version : 1.2.3
  =================================================================
  </code></pre>