Include login/alwayson in legacy VPN editor dialog

A little more consistent with the new app VPNs' dialogs. To make this
work it was also necessary to restart the lockdown VPN every time it is
edited, which makes sense because the expected action after editing a
VPN is that it reconnects with the new settings.

Bug: 28072644
Change-Id: I4b6a6f0a6ed96d2ec6f62889fdae4abb60d0646c