T6629: call check_kmod within a standard config function

[jestabro]

Change Summary

As with #3927, move the remaining calls to check_kmod within a standard function, with placement determined by the needs of the config script.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

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Related PR(s)

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Smoketest result

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

[github-actions]

👍
No issues in PR Title / Commit Title

[github-actions]

❌
warning: Unused Warning imported from vyos.base in src/conf_mode/vpn_ipsec.py:28.

[jestabro]

@Mergifyio backport circinus

[mergify]

backport circinus

✅ Backports have been created

• #3935 T6629: call check_kmod within a standard config function (backport #3932) has been created for branch circinus