Refine logging in pkg/selector/physicalmachine

[g1eny0ung]

What problem does this PR solve?

Close #2887

What's changed and how it works?

Related changes

• This change also requires further updates to the website (e.g. docs)
• This change also requires further updates to the UI interface
• Need to cheery-pick to release branches
  • release-2.5
  • release-2.4

Checklist

CHANGELOG

• I have updated the CHANGELOG.md
• I have labeled this PR with "no-need-update-changelog"

Tests

• Unit test
• E2E test
• No code
• Manual test (add steps below)

Side effects

• Breaking backward compatibility

DCO

If you find the DCO check fails, please run commands like below (Depends on the actual situations. For example, if the failed commit isn't the most recent) to fix it:

git commit --amend --signoff
git push --force

[codecov]

Codecov Report

Merging #4037 (1626737) into master (7c75a0e) will decrease coverage by 0.07%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master    #4037      +/-   ##
==========================================
- Coverage   38.53%   38.46%   -0.07%     
==========================================
  Files         167      167              
  Lines       13734    13729       -5     
==========================================
- Hits         5292     5281      -11     
- Misses       8010     8013       +3     
- Partials      432      435       +3     

Impacted Files	Coverage Δ
pkg/selector/physicalmachine/selector.go	35.22% <50.00%> (+1.07%)	⬆️

... and 10 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7c75a0e...1626737. Read the comment docs.

[STRRL]

/lgtm

[chaotic-prow]

New changes are detected. LGTM label has been removed.

[g1eny0ung]

/lgtm

[chaotic-prow]

@g1eny0ung: you cannot LGTM your own PR.

In response to this:

/lgtm

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[chaotic-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: g1eny0ung, STRRL

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [STRRL,g1eny0ung]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment