issue=1114: leveldb support version snapshot#1115

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caijieming-ng wants to merge 2 commits intobaidu:masterfrom caijieming-ng:vsnapshot

+559-18

Commits on Dec 14, 2016

issue=1114: leveldb support version snapshot
caijieming
committed

Commits on Dec 15, 2016

issue=1114: LogAndApply multi-thread safe
caijieming
committed