Werk #1702: Fix check_notify_count: notification had been counted twice

The active check for counting the notifications of users have been fixed. The dummy contact check-mk-notify is now being handled separately. We make a distinction between raw notifications - notifications created by the monitoring - and user notification - those being sent out to users.

Note: in the rule based notifications one raw notification can create several user notifications. Other raw notifications might create no user notification at all.

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