title: vscode multiple terminals configuration issue
body: <p>I was reading with new features of vscode 1.9, adding/working with multiple terminals, however I ended up with adding multiple terminals of same type. e.g. cmd.<br>
  Is there way I can option to choose what type of terminal I can use, either bash(git), cmd (windows) OR bash(Ubuntu)?  So following dropdown of vscode terminal should change as:</p>
  
  <p><a href="https://i.stack.imgur.com/HBgQX.png" rel="noreferrer"><img src="https://i.stack.imgur.com/HBgQX.png" alt="enter image description here"></a></p>
  
  <ol>
  <li>cmd.exe</li>
  <li>bash.exe (Git)</li>
  <li>bash.exe (Ubuntu)</li>
  </ol>
  
  <p>I tried to change setting.json file for <code>"terminal.integrated.shell.windows"</code>, however it considers only last value.</p>