Move new Drive authentication flow to a new JSP

To be able to identify if the Nuxeo instance has the hotfixes allowing to authenticate the user through the browser, we can use a new JSP.
This way, if Drive receives a 404 HTTP error when trying to access it, we know that it is not available. Otherwise, Drive will receive a 401, because the page exists but the user is not logged in.

New page content :

"Authentication successful : You'll be redirected to Drive shortly...
If Drive settings is not opening, click here to open it - you can also browse to your content and start editing documents on desktop or synchronize folders.

Link 1 : attempt to open drive settings window
Link 2 : go to nuxeo server home page (authenticated)