Implement EIP preferences
SharedPreferences under its own key. Used by EIP controller logic to establish connections.
Preferences include:
- Autostart EIP on boot
- (future) Preferred gateway Cluster
- Block Internet on EIP connection loss (see #2023 (closed))
What other preferences do we want? Can the user open an advanced prefs dialog and edit VPN client settings?
(from redmine: created on 2013-03-19, closed on 2013-04-15)