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All leveldb uses now set the reuse_logs option to trigger a new fast open path.
For db's with prior changes (i.e. non-empty logs) this avoids three fsync calls
(on average) for every open as well as the need to compact (rewrite) the db.

More info at:

https://github.com/google/leveldb/commit/251ebf5dc70129ad3c38193fe6c99a5b0ec6b9fa

BUG=468810

Review URL: https://codereview.chromium.org/1025433003

Cr-Commit-Position: refs/heads/master@{#322433}