title: Cannot get groups folder on iOS 11 simulators
body: <p>The following always returns nil on all iPhone 11 simulators but works fine on devices and simulators prior to 11.</p>
  
  <pre><code>let containerURL = fileManager.containerURL(forSecurityApplicationGroupIdentifier: "group.my.group.name.here")
  </code></pre>
  
  <p>Anyone else encounter this? What is the solution?</p>