Merge changes from topic "dec13_netrevert"

* changes:
  Revert "[NS A24] Add an object to represent changes in assignment"
  Revert "[NS A25] Send all listen callbacks after all rematches"
  Revert "[NS A26] Move available callbacks out of the rematch computation"
  Revert "[NS A27] Remove useless logs and a useless var"
tree: 4d9b16a200dfeebfa997bf4c192eecaeb306520b
  1. core/
  2. services/
  3. tests/