changing current provider should update VPN status
currently, the vpn status area shows different things if there is a valid client certificate or not.
if the cert is valid, then it lets you connect. otherwise, you must login first if you are not logged in.
when you change the current provider, the vpn status area does not update.
if the former provider did not have a valid cert, but then the newly selected provider does have a valid cert, you should be able to connect the vpn for the newly selected provider without logging in.
(from redmine: created on 2014-08-19, closed on 2014-08-20, relates #5997 (closed))