cluster: adjust error message of selinux check

[AstroProfundis]

What problem does this PR solve?

Close #1449

What is changed and how it works?

Adjust the error message to avoid formatting issues

Check List

Tests

• Manual test (add detailed scripts or steps below)

Related changes

• Need to cherry-pick to the release branch

Release notes:

NONE

[codecov-commenter]

Codecov Report

Merging #1476 (8b0ec4b) into master (00548a9) will decrease coverage by 1.09%.
The diff coverage is 59.16%.

@@            Coverage Diff             @@
##           master    #1476      +/-   ##
==========================================
- Coverage   56.71%   55.62%   -1.10%     
==========================================
  Files         242      292      +50     
  Lines       17469    25917    +8448     
==========================================
+ Hits         9908    14416    +4508     
- Misses       6265     9488    +3223     
- Partials     1296     2013     +717     

Flag	Coverage Δ
cluster	42.99% <63.31%> (?)
coverage	?
dm	26.42% <42.18%> (?)
integrate	50.38% <50.21%> (?)
playground	14.23% <52.88%> (?)
tiup	16.16% <49.30%> (?)
unittest	22.82% <25.87%> (?)

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

Impacted Files	Coverage Δ
cmd/telemetry.go	27.41% <0.00%> (ø)
components/cluster/command/import.go	19.10% <0.00%> (ø)
components/cluster/command/telemetry.go	24.00% <0.00%> (ø)
components/playground/instance/drainer.go	0.00% <0.00%> (ø)
components/playground/instance/pump.go	0.00% <0.00%> (ø)
components/playground/instance/ticdc.go	0.00% <0.00%> (ø)
components/playground/instance/tiflash_config.go	100.00% <ø> (ø)
pkg/base52/base52.go	87.50% <ø> (ø)
pkg/checkpoint/checkpoint.go	82.79% <ø> (ø)
pkg/checkpoint/field.go	100.00% <ø> (ø)
... and 665 more

---

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[lucklove]

LGTM

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lucklove

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[AstroProfundis]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 6046827