Correctly preallocate files in universal compaction
Summary: In universal compaction, MaxFileSizeForLevel is ULLONG_MAX. We've been preallocation files to UULONG_MAX size all these time :) Test Plan: make check Reviewers: dhruba, haobo, ljin, sdong, yhchiang Reviewed By: yhchiang Subscribers: leveldb Differential Revision: https://reviews.facebook.net/D18915
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