it can probably double closed because the way we managed `try() finally {}` at
shutting down entry log manager. we can fix the logic there. however I don't
think that is a redirection to go, because if close() is being called twice in
different places, the problem still exists. so I went down to this path to make
close idempotent in the base class, which it will address the problem of now
and any potentially problems in future.
[ Full content available at: https://github.com/apache/bookkeeper/pull/1735 ]
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