pump client: support change select pump's strategy#221

Merged

WangXiangUSTC merged 4 commits intopingcap:masterfrom WangXiangUSTC:xiang/strategy

Mar 21, 2019

Commits on Mar 19, 2019

support change select pump's strategy
WangXiangUSTC
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Commits on Mar 20, 2019

Commits on Mar 21, 2019

merge master
WangXiangUSTC
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