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4-node cluster (A, B, C, D). A is initially elected a leader. The leader adds a new configuration entry, that removes it from the cluster (B, C, D). Communicate the cluster up to the point where A starts to resign its leadership (calls `transfer_leadership()`). At this point, A should send a `timeout_now` message to one the remaining nodes (B, C or D) and the new configuration should be committed. But no nodes actually have received the `timeout_now` message yet. Determine on which node the message should arrive, accept the `timeout_now` message and disconnect the target from the rest of the group. Check that after that the cluster, which has only two live members, could progress and elect a new leader through a normal election process. tests: unit(dev, debug) Signed-off-by: Pavel Solodovnikov <pa.solodovnikov@scylladb.com>