Simperium Connectivity Improvements

Improves Simperium connectivity by making sure buckets are started in `NotificationsActivity`

Also updates Simperium to `0.4.11`, which uses a new web socket manager which could help with #1684 as well.
It needs to specifically be `NOT_AUTHORIZED` because Simperium will return that status if there's a problem with the auth. The user is defaulted to `AUTHORIZED` here: https://github.com/wordpress-mobile/WordPress-Android/blob/issue/1684-stuck-notifications/WordPress/src/main/java/org/wordpress/android/ui/notifications/SimperiumUtils.java#L93