Add a new protocol for custom notification #47
Merged
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Currently we are using this protocol for the notification of
out-of-log-range for lagging follower, in case when log has been
compacted without creating any snapshots (it should not happen in
normal case, must be user's fault).
Added a new callback type for out-of-log-range, so that user can
handle this situation smoothly, rather than crash or abort.