Realm dropdown doesn't work with Juniper server

[dlenski]

It's impossible to change the realm on a Juniper server. (authgroup dropdown in OpenConnect terms)

The UI reloads as soon as the selection is changed, and the new value isn't persisted.

• The problem is that the front-end is assuming that returning NEWGRP from a form handler will cause something to actually be submitted to the server, and that the front-end doesn't need to remember the state change itself.
• This was a reasonable assumption for Cisco AnyConnect, and also works for GP where we're abusing authgroup to hold the gateway selection. Doesn't work for Juniper where it's just an ordinary dropdown box in a form.