Enhancement: Updated WebFinger flow

WebFinger call won't follow redirections. WebFinger will be requested first and will skip status.php
in case it's successful, and in case the lookup server is not directly accessible, we will continue
the authentication flow with the regular status.php.

https://github.com/owncloud/android/issues/3998
https://github.com/owncloud/android/pull/4000
https://github.com/owncloud/android-library/pull/555
