title: Xcode 9 distribution build fails because format of exportOptions.plist has changed in new release
body: <p>I am trying to compile an ad-hoc IPA for my app using SDK version 6.1.2 and Xcode 9 beta (trying to see if the app works in the new version). My build is failing with the following error message:</p>
  
  <pre><code>Error Domain=IDEProvisioningErrorDomain Code=9 ""DGHospice.app" 
  requires a provisioning profile." UserInfo=
  {NSLocalizedDescription="DGHospice.app" requires a provisioning 
  profile., NSLocalizedRecoverySuggestion=Add a profile to the 
  "provisioningProfiles" dictionary in your Export Options property  
  list.}
  </code></pre>
  
  <p>The Distribution Profile is valid and I can create an IPA if I use iOS SDK 10. Build only fails in 11.0.
  Can someone help me pinpoint the issue?</p>