BOOKKEEPER-612 RegionAwarePlacement Policy Progress

Hi BookKeepers, I would like to ping on BOOKKEEPER-612, which has a pending PR. It is actually blocking the work on https://issues.apache.org/jira/browse/BOOKKEEPER-912 Allow EnsemblePlacementPolicy to choose bookies using ledger custom data (multitenancy support) as this is changes the

Build failed in Jenkins: bookkeeper-master #1511

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