title: VS2017 Git fails to clone with Proxy CONNECT aborted error
body: <p>Trying to clone a repo from git under VSTS in Visual Studio 2017 but get the following error:</p>
  
  <pre><code> Git failed with a fatal error. 
   unable to access https://myaccount.visualstudio.com/_git/MyProject/: 
   Proxy CONNECT aborted
  </code></pre>
  
  <p>Am in a corporate environment with a proxy in place for internet access.
  Have tried setting the defaultProxy setting in system.net in the devenv.exe.config but makes no difference.</p>
  
  <pre><code>&lt;system.net&gt;
      &lt;defaultProxy useDefaultCredentials="true"&gt;
      &lt;proxy proxyaddress="http://proxyurl:8080" bypassonlocal="True" /&gt;
  &lt;/defaultProxy&gt;
  </code></pre>
  
  <p>Visual Studio 2015 works without issue.</p>