cache agent change optimize

[huiwq1990]

Signed-off-by: huiwq1990 huiwq1990@163.com

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In response to this:

Signed-off-by: huiwq1990 huiwq1990@163.com

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:
/kind bug
/kind documentation
/kind enhancement
/kind good-first-issue
/kind feature
/kind question
/kind design
/sig ai
/sig iot
/sig network
/sig storage

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Fixes #

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Does this PR introduce a user-facing change?

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[codecov]

Codecov Report

Merging #1008 (02a1bfe) into master (b9f6bd7) will decrease coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1008      +/-   ##
==========================================
- Coverage   47.46%   47.40%   -0.06%     
==========================================
  Files          85       85              
  Lines       11799    11791       -8     
==========================================
- Hits         5600     5590      -10     
- Misses       5738     5739       +1     
- Partials      461      462       +1     

Flag	Coverage Δ
unittests	47.40% <100.00%> (-0.06%)	⬇️

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

Impacted Files	Coverage Δ
pkg/yurthub/cachemanager/cache_agent.go	49.27% <100.00%> (-5.28%)	⬇️
pkg/util/iptables/iptables.go	87.12% <0.00%> (-0.55%)	⬇️
pkg/yurtctl/cmd/yurttest/kindinit/init.go	50.71% <0.00%> (ø)

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[rambohe-ch]

/lgtm
/approve

[openyurt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: huiwq1990, rambohe-ch

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