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When network topology stabilization uses a slave policy, onClusterChanged must not replace the parent dead-bookie set with the slave result.
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Fixes #4735
Motivation
RackawareEnsemblePlacementPolicy.onClusterChangedforwards cluster updates to a slave policy whennetworkTopologyStabilizePeriodSeconds > 0. The implementation replaced the parent dead-bookie set with the slave return value, so a bookie removal could yield an empty set even though the parent (non-stabilized) policy had already detected the departure.Changes
onClusterChangedinstead of assigning over the parent result.testPlacementOnStabilizeNetworkTopologyto assert the removed bookie is reported as dead when stabilization is enabled.Test plan
JAVA_HOME=…/jdk-21 mvn -pl bookkeeper-server -Dtest=TestRackawareEnsemblePlacementPolicy#testPlacementOnStabilizeNetworkTopology test