Zen: handle exit conditions across reboots.

- Use the persisted exit condition (and a new
  persisted exit component) to immediately resubscribe
  to the manual exit condition (if present)
- Fire false immediately for old countdown conditions.
- Add a new zen lens to noman dump, and a bit more info.
- Refresh the current exit condition when reopening the panel.

Bug:15844990
Bug:16212455
Change-Id: I8bfaf1b2a6cf3d8818002a9db5c527ad3aa4c05c