Fix log level

[hoyhbx]

What problem does this PR solve?

This PR solves the problem mentioned in #4684. Basically, we propose to use ERROR logs that report erroneous user input when rejecting them. In principle, any errors should be logged with ERROR (user error is no exception). Currently, INFO logs are used which makes it very difficult to identify those errors from a large number of INFO logs. This PR fixes the usage of the level of the log.

What is changed and how does it work?

We changed the level of klog from Infof to Errorf where the log to be printed contains an error (err in the code), while Infof is used for the log.

Code changes

• Has Go code change
• Has CI related scripts change

Tests

We believe this fix is straightforward since only the log level is changed and no test is needed.

• Unit test
• E2E test
• Manual test
• No code

Side effects

• Breaking backward compatibility
• Other side effects:

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

NONE

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[codecov-commenter]

Codecov Report

Merging #4685 (07767f1) into master (b84b18b) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #4685      +/-   ##
==========================================
- Coverage   63.58%   63.57%   -0.02%     
==========================================
  Files         196      196              
  Lines       21315    21315              
==========================================
- Hits        13554    13550       -4     
- Misses       6537     6539       +2     
- Partials     1224     1226       +2     

Flag	Coverage Δ
unittest	63.57% <0.00%> (-0.02%)	⬇️