Enhance/fix FileBasedWAL (#27)
* Enhance/fix FileBasedWAL 1) Support log rollback 2) Separate buffer flusher logic, so that the number of flushers is independent from the number of WALs/Shards 3) Improve the multiple threads support, but still not support multiple threads calling appendLogs()/rollbackToLog() 4) Add UT for rollback 5) Fix the flaky UTs * Rebased and addressed dutor's comments
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