[HBASE-5688] Convert zk root-region-server znode content to pb - ASF JIRA

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Incompatible change, Reviewed
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Changes the content of the root location znode, root-region-server, to be
four magic bytes ('PBUF') followed by a protobuf message that holds the
ServerName of the server currently hosting root.

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Changes the content of the root location znode, root-region-server, to be four magic bytes ('PBUF') followed by a protobuf message that holds the ServerName of the server currently hosting root.

Move the root-region-server znode content from the versioned bytes that ServerName.getVersionedBytes outputs to instead be pb.

is related to

HBASE-5446 Replace serialization for client-facing ZK data with PBs