Fix controller panic in cilium ipam is multi-pool

[cyclinder]

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• unite test or E2E test
• do not forget essential code comment and log
• document for the PR
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  "release/none"
  "release/bug"
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What issue(s) does this PR fix:

Fixes #4454
Fixes #4457

Special notes for your reviewer:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.90%. Comparing base (af32c65) to head (0868859).
Report is 3 commits behind head on release-v0.9.

Additional details and impacted files

@@              Coverage Diff              @@
##           release-v0.9    #4461   +/-   ##
=============================================
  Coverage         80.90%   80.90%           
=============================================
  Files                50       50           
  Lines              5472     5472           
=============================================
  Hits               4427     4427           
  Misses              882      882           
  Partials            163      163           

Flag	Coverage Δ
unittests	80.90% <ø> (ø)

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