CNF-24259: Consolidate duplicate normalizeHost functions

[sebrandon1]

Summary

• Replace three identical host-normalization functions with a single exported stringutil.NormalizeHost()
• All three trimmed whitespace and stripped IPv6 square brackets with the same 5-line body
• Add 9 test cases covering IPv4, IPv6 (bracketed/unbracketed), whitespace, empty, and hostname inputs

Jira: CNF-24259

Functions removed

Function	File
normalizeHost()	cmd/tls-scanner/main.go
normalizeTargetHost()	internal/scanner/scanner.go
normalizeTemplateHost()	internal/scanner/template.go

Replaced with

stringutil.NormalizeHost() in internal/stringutil/stringutil.go

Test plan

• go build ./... passes
• go test ./... passes
• make lint passes
• New TestNormalizeHost covers 9 input variants

[openshift-ci-robot]

@sebrandon1: This pull request references CNF-24259 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "5.0.0" version, but no target version was set.

Details

In response to this:

Summary

• Replace three identical host-normalization functions with a single exported stringutil.NormalizeHost()
• All three trimmed whitespace and stripped IPv6 square brackets with the same 5-line body
• Add 9 test cases covering IPv4, IPv6 (bracketed/unbracketed), whitespace, empty, and hostname inputs

Jira: CNF-24259

Functions removed

Function	File
normalizeHost()	cmd/tls-scanner/main.go
normalizeTargetHost()	internal/scanner/scanner.go
normalizeTemplateHost()	internal/scanner/template.go

Replaced with

stringutil.NormalizeHost() in internal/stringutil/stringutil.go

Test plan

• go build ./... passes
• go test ./... passes
• make lint passes
• New TestNormalizeHost covers 9 input variants

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[openshift-ci]

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[openshift-ci]

@sebrandon1: all tests passed!

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Details

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