Revert "dm/test: swap upstream and downstream of sync_diff in some ca… (#4382) #4399
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This is an automated cherry-pick of #4382
…ses (#3413)"
This reverts commit 35102b5.
What problem does this PR solve?
Issue Number: ref #4159
What is changed and how it works?
revert since pingcap/tidb-tools#583 is closed (may need to wait nightly build)
Check List
Tests
Release note