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*Motivation*

There have two ways that will cause the offload data cleanup. One is met
offload conflict exception, and another is completeLedgerInfoForOffloaded
reaches max retry time and throws zookeeper exceptions.

We retry the zookeeper operation on connection loss exception. We should
be careful about this exception, because we may loss data if the metadata
update successfully.

When a MetaStore exception happens, we can not make sure the metadata update is
failed or not. Because we have a retry on the connection loss, it is
possible to get a BadVersion or other exception after retrying.

So we don't clean up the data if this happens.

*Modification*

- don't delete data if has meta store exception