bug-fix: use table-info-before always and fix bug for recover lock in optimistic (#1518)

[ti-srebot]

cherry-pick #1518 to release-2.0
You can switch your code base to this Pull Request by using git-extras:

# In dm repo:
git pr https://github.com/pingcap/dm/pull/1536

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/dm.git pr/1536:release-2.0-69f65ca4a4e0

---

What problem does this PR solve?

#1510 case4

What is changed and how it works?

• if table-info-before of an info is different with table saved in master(like worker restart and TrySync twice)
  • use table-info-before always
  • joined tables base on table-info-before as oldJoined
• when recovering lock
  • join all info
  • build lock with joined info, update tables with tableInfoBefore
  • sort the infos, TrySync them one by one

Check List

Tests

• unit test
• integration test

[lichunzhu]

/lgtm

[lichunzhu]

/merge

[ti-chi-bot]

@lichunzhu: /merge in this pull request requires 2 /lgtm.

In response to this:

/merge

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[lance6716]

/lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lance6716
• lichunzhu

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[lance6716]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: c614263