Update version of kind to v0.11.1 and version of ubuntu to 20.04 (#4063)

[ti-srebot]

cherry-pick #4063 to release-1.1
You can switch your code base to this Pull Request by using git-extras:

# In tidb-operator repo:
git pr https://github.com/pingcap/tidb-operator/pull/4066

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

git push git@github.com:ti-srebot/tidb-operator.git pr/4066:release-1.1-74ccda087708

---

What problem does this PR solve?

Close #4059

Ref kubernetes-sigs/kind#2241

Remove test shell tests/examples/003-basic-cn.sh.

What is changed and how does it work?

Code changes

• Has Go code change
• Has CI related scripts change

Tests

• Unit test
• E2E test
• Manual test
• No code

Side effects

• Breaking backward compatibility
• Other side effects:

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

[ti-srebot]

@KanShiori you're already a collaborator in bot's repo.

[DanielZhangQD]

/test pull-e2e-kind-serial

[DanielZhangQD]

/test pull-e2e-kind-serial

[DanielZhangQD]

/test pull-e2e-kind-serial

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (release-1.1@79ad44b). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head 5858c67 differs from pull request most recent head 4644937. Consider uploading reports for the commit 4644937 to get more accurate results

@@              Coverage Diff               @@
##             release-1.1    #4066   +/-   ##
==============================================
  Coverage               ?   52.57%           
==============================================
  Files                  ?      161           
  Lines                  ?    15633           
  Branches               ?        0           
==============================================
  Hits                   ?     8219           
  Misses                 ?     6631           
  Partials               ?      783           

Flag	Coverage Δ
unittest	52.57% <0.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

[DanielZhangQD]

LGTM

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• DanielZhangQD

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[DanielZhangQD]

/merge

[ti-chi-bot]

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

Commit hash: 6771e71

[ti-chi-bot]

@ti-srebot: Your PR was out of date, I have automatically updated it for you.

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