Add cache memory limit for syncer of drainer#715

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lichunzhu wants to merge 12 commits intopingcap:masterfrom lichunzhu:czli/addCacheMemoryLimit

+240-28

Commits on Aug 13, 2019

add cache memory limit in drainer
lichunzhu
committed

Commits on Aug 15, 2019

Commits on Aug 19, 2019

delete go func in binlogItemCache
lichunzhu
committed

Commits on Aug 23, 2019