[CF] Better handling of memtable logs
Summary: DBImpl now keeps a list of alive_log_files_. On every FindObsoleteFiles, it deletes all alive log files that are smaller than versions_->MinLogNumber() Test Plan: make check passes no specific unit tests yet, will add Reviewers: dhruba, haobo CC: leveldb Differential Revision: https://reviews.facebook.net/D16293
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