config: fix configs cannot set to zero values#1334

Merged

disksing merged 4 commits intotikv:masterfrom oh-my-tidb:config

Nov 22, 2018

+91-17

Commits on Nov 20, 2018

Commits on Nov 21, 2018

update default config to keep behaivour consistent
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committed

Commits on Nov 22, 2018

Merge branch 'master' into config
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