properly handling the agent parameters aparam_rollup_status and aparam_child_agg_status

- Now properly handling the agent parameters aparam_rollup_status and aparam_child_agg_status for propagation of updates triggered by a DeviceAggregateStatusEvent from a child (sub-platform or instrument).

- New test test_platform_status_small_network_5 to verify the propagation with a multi-level 5-platform network.