Gc something at destory "NameSlaveImpl" instance and format logs#803

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baobaoyeye wants to merge 3 commits intobaidu:masterfrom

baobaoyeye:patch-1

Commits on Jan 11, 2017

delete leveldb before exit function
baobaoyeye
committed

Commits on Jan 15, 2017

Merge branch 'master' of https://github.com/baidu/bfs into utils_branch
baobaoyeye
committed
gc something at destory MasterSlaveImpl and logs format
baobaoyeye
committed