Restore collecting all errors from all supervisors
Created by: jhakala
Martin tested causing errors that would appear in multiple supervisors and reported:
well no. LV1 listened to the 1st notification and decided to goToError. Thus stops listening to the LV2's notifications. I think we have been doing this since we use notification system
Today we had an issue that affected all of the HCAL partitions, but the error that appeared looked like the problem was localized to HO. We should restore the old behavior [before using the notification system to propagate supervisor errors, the SUPERVISOR_ERROR parameter and the error message sent to the level0 collected all the errors from all the supervisors.]