fix vf config format

[BSWANG]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 59.21%. Comparing base (e151b4c) to head (7b94c0e).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
plugin/driver/vf/vf.go	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #906      +/-   ##
==========================================
+ Coverage   59.13%   59.21%   +0.07%     
==========================================
  Files         131      131              
  Lines       19529    19536       +7     
==========================================
+ Hits        11549    11568      +19     
+ Misses       6835     6823      -12     
  Partials     1145     1145              

Flag	Coverage Δ
unittests	59.21% <88.88%> (+0.07%)	⬆️

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