binlog: use pumps client to write binlog#8098

Merged

zimulala merged 3 commits intopingcap:release-2.1from WangXiangUSTC:xiang/cherry-pick

Oct 30, 2018

+108-136

Commits on Oct 29, 2018

minor update

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format code
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Commits on Oct 30, 2018

Merge branch 'release-2.1' into xiang/cherry-pick
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