title: Cloud build failing on git submodules
body: <p>I have a Unity project in a git repo hosted on VSTS with submodules, I've integrated it the git repo with Unity cloud build.</p>
  
  <p>When Cloud Build tires to do a build it seems to go fine checking everything out until it reaches the modules, it hangs on the line '328: Cloning into 'Assets/MySubmodule'... and just waits there for about an hour before the build fails for taking too long.</p>
  
  <p>I get an error sometimes that goes like:</p>
  
  <p>Username for '<a href="https://mycompany.visualstudio.com" rel="nofollow noreferrer">https://mycompany.visualstudio.com</a>': Clone of '<a href="https://mycompany.visualstudio.com/DefaultCollection/_git/mysubmodulerepopath" rel="nofollow noreferrer">https://mycompany.visualstudio.com/DefaultCollection/_git/mysubmodulerepopath</a>' into submodule path 'Assets/mysubmodule' failed</p>
  
  <p>I'm thinking the issue might be that the submodules are not being referenced as ssh links but directly as https, is there some work around or something I need to do to get them to work?</p>