Add versioning for ZK metadata
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Key: BOOKKEEPER-84
URL: https://issues.apache.org/jira/browse/BOOKKEEPER-84
Project: Bookkeeper
Issue Type: Improvement
Reporter: Ivan Kelly
Assignee: Ivan Kelly
Fix For: 3.4.0
There's no zk metadata versioning, which means that reading clients may
misinterpret the data saved in ZK.
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