coodirnator: optimize the detectiong timeout for ip conflict and gateway detection

[cyclinder]

Thanks for contributing!

Notice:

• unite test or E2E test
• do not forget essential code comment and log
• document for the PR
• release note label
  "release/none"
  "release/bug"
  "release/feature"
• read about Contribution notice: https://spidernet-io.github.io/spiderpool/latest/develop/contributing/

What issue(s) does this PR fix:

Fixes #4508

Special notes for your reviewer:

[codecov]

Codecov Report

Attention: Patch coverage is 83.58209% with 11 lines in your changes missing coverage. Please review.

Project coverage is 80.58%. Comparing base (16fd442) to head (1268120).
Report is 3 commits behind head on release-v0.8.

Files with missing lines	Patch %	Lines
pkg/utils/utils.go	83.58%	7 Missing and 4 partials ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##           release-v0.8    #4512       +/-   ##
=================================================
+ Coverage          1.40%   80.58%   +79.17%     
=================================================
  Files                54       50        -4     
  Lines              6332     5552      -780     
=================================================
+ Hits                 89     4474     +4385     
+ Misses             6233      906     -5327     
- Partials             10      172      +162     

Flag	Coverage Δ
unittests	80.58% <83.58%> (+79.17%)	⬆️

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

Files with missing lines	Coverage Δ
pkg/utils/utils.go	68.86% <83.58%> (ø)

... and 54 files with indirect coverage changes