[MINOR] fix(test): Fix flaky test for DynamicClientConfServiceHadoopTest

[maobaolong]

What changes were proposed in this pull request?

Fix flaky test for DynamicClientConfServiceHadoopTest

Why are the changes needed?

Make ci stable.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Existing UTs.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.60%. Comparing base (580b4f2) to head (01bfb4e).
Report is 6 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2326      +/-   ##
============================================
+ Coverage     51.19%   51.60%   +0.40%     
- Complexity     2936     2972      +36     
============================================
  Files           486      474      -12     
  Lines         24720    22683    -2037     
  Branches       2041     2090      +49     
============================================
- Hits          12656    11706     -950     
+ Misses        11274    10231    -1043     
+ Partials        790      746      -44     

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[github-actions]

Test Results

 2 966 files  ±0   2 966 suites  ±0   6h 27m 34s ⏱️ +16s
 1 100 tests ±0   1 098 ✅ ±0   2 💤 ±0  0 ❌ ±0 
13 774 runs  ±0  13 744 ✅ ±0  30 💤 ±0  0 ❌ ±0 

Results for commit 01bfb4e. ± Comparison against base commit 3b0521a.

♻️ This comment has been updated with latest results.

[maobaolong]

@jerqi Thanks for your review!