ARROW-3226: [Plasma] Fix small memory crash#2550

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guoyuhong wants to merge 4 commits intoapache:masterfrom

ant-tech-alliance:fixSmallMemoryCrash

Commits on Sep 12, 2018

Fix Plasma Crash when capacity is smaller than total memory.
Yuhong Guo
committed
Add small memory test.
Yuhong Guo
committed
Lint and refine.
Yuhong Guo
committed
Remove log
Yuhong Guo
committed