koordlet: fix kubelet policy nil

[huiwq1990]

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.04 ⚠️

Comparison is base (bb3227d) 67.26% compared to head (1f04979) 67.22%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1073      +/-   ##
==========================================
- Coverage   67.26%   67.22%   -0.04%     
==========================================
  Files         255      255              
  Lines       28619    28620       +1     
==========================================
- Hits        19251    19241      -10     
- Misses       8029     8039      +10     
- Partials     1339     1340       +1     

Flag	Coverage Δ
unittests	67.22% <0.00%> (-0.04%)	⬇️

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

Impacted Files	Coverage Δ
pkg/koordlet/resmanager/cpu_suppress.go	69.71% <0.00%> (-0.17%)	⬇️
pkg/koordlet/runtimehooks/reconciler/reconciler.go	61.76% <0.00%> (-4.12%)	⬇️
pkg/util/httputil/reverseproxy.go	84.30% <0.00%> (-0.80%)	⬇️

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[jasonliu747]

/lgtm

[zwzhang0107]

/lgtm
/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: zwzhang0107

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