server: add extra wait time(DNM)

[bb7133]

What problem does this PR solve?

Issue Number: None

Problem Summary: add extra 15s wait time to make sure most secondary lock async commits will be done, used for some tests.

What changed and how does it work?

Check List

Tests

• NA

Side effects

• NA

Documentation

• NA

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

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[ti-chi-bot]

[FORMAT CHECKER NOTIFICATION]

Notice: To remove the do-not-merge/needs-linked-issue label, please provide the linked issue number on one line in the PR body, for example: Issue Number: close #123 or Issue Number: ref #456.

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[tiprow]

@bb7133: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
fast_test_tiprow	872052f	link	true	/test fast_test_tiprow

Full PR test history. Your PR dashboard.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.8678%. Comparing base (3292909) to head (872052f).
Report is 12 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #52895         +/-   ##
=================================================
- Coverage   72.4181%   55.8678%   -16.5503%     
=================================================
  Files          1480       1594        +114     
  Lines        428299     602731     +174432     
=================================================
+ Hits         310166     336733      +26567     
- Misses        98908     243022     +144114     
- Partials      19225      22976       +3751     

Flag	Coverage Δ
integration	36.8095% <100.0000%> (?)

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

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	49.3660% <ø> (+8.1435%)	⬆️

[ti-chi-bot]

@bb7133: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/unit-test	872052f	link	true	/test unit-test

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.