Flush Data at object destruction if disableWal is used.
Summary: Added a conditional flush in ~DBImpl to flush. There is still a chance of writes not being persisted if there is a crash (not a clean shutdown) before the DBImpl instance is destroyed. Test Plan: modified db_test to meet the new expectations. Reviewers: dhruba, heyongqiang Differential Revision: https://reviews.facebook.net/D6519
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