Option to disable leveldb's recovery log#225

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matthewvon wants to merge 3 commits intodevelopfrom

mv-disable-recovery-log

Commits on Feb 28, 2017

add logic for disable_recovery_log in destructor, Write, MakeRoomForWrite, and NewRecoveryLog
Matthew V
committed
add fourth test scenario for disable_recovery_log flag. fix up one test due to that change.
Matthew V
committed
add disable_recovery_flag option.
Matthew V
committed