title: xcodebuild -exportArchive fails with error Locating signing assets failed
body: <p>I'm using command line xcodebuild tool to export .ipa files from Xcode archives. It was working fine up to Xcode 8.3.3. The same setup has stopped working with Xcode 9 beta. Now it fails with this error:</p>
  
  <pre><code>IDEDistribution: Step failed: &lt;IDEDistributionSigningAssetsStep: 0x7fc309310550&gt;: Error Domain=IDEDistributionSigningAssetStepErrorDomain Code=0 "Locating signing assets failed."
  </code></pre>
  
  <p>It seems Xcode 9 cannot locate the provisioning profiles, but why?</p>