optmize the logic of listNamespacesForDistributor func

[hantmac]

Signed-off-by: hantmac hantmac@outlook.com

Ⅰ. Describe what this PR does

Optmize the logic of listNamespacesForDistributor func.

Ⅱ. Does this pull request fix one issue?

NONE

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

[codecov-commenter]

Codecov Report

Merging #952 (19dfd52) into master (5b52b6e) will decrease coverage by 0.09%.
The diff coverage is 100.00%.

❗ Current head 19dfd52 differs from pull request most recent head c560a0b. Consider uploading reports for the commit c560a0b to get more accurate results

@@            Coverage Diff             @@
##           master     #952      +/-   ##
==========================================
- Coverage   49.99%   49.90%   -0.10%     
==========================================
  Files         119      119              
  Lines       11535    11536       +1     
==========================================
- Hits         5767     5757      -10     
- Misses       4896     4903       +7     
- Partials      872      876       +4     

Flag	Coverage Δ
unittests	49.90% <100.00%> (-0.10%)	⬇️

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

Impacted Files	Coverage Δ
pkg/controller/resourcedistribution/utils.go	75.52% <100.00%> (+0.17%)	⬆️
pkg/controller/cloneset/cloneset_status.go	83.78% <0.00%> (-5.41%)	⬇️
pkg/controller/cloneset/cloneset_controller.go	52.17% <0.00%> (-4.35%)	⬇️
pkg/controller/daemonset/daemonset_update.go	55.75% <0.00%> (+0.88%)	⬆️

---

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[veophi]

/lgtm

[FillZpp]

/approve

[kruise-bot]

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