T6313: Add "NAT" to "generate" command for rule resequence (backport #3715)

[mergify]

Change Summary

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):

Related Task(s)

• https://vyos.dev/T6313

Related PR(s)

Component(s) name

Proposed changes

How to test

generate firewall rule-resequence
generate firewall rule-resequence start 200
generate firewall rule-resequence start 200 step 100

generate nat rule-resequence
generate nat rule-resequence start 200
generate nat rule-resequence start 200 step 100

generate nat64 rule-resequence
generate nat64 rule-resequence start 200
generate nat64 rule-resequence start 200 step 100

generate nat66 rule-resequence
generate nat66 rule-resequence start 200
generate nat66 rule-resequence start 200 step 100

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

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This is an automatic backport of pull request #3715 done by [Mergify](https://mergify.com).

[github-actions]

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No issues in PR Title / Commit Title

[github-actions]

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warning: Unused import os in smoketest/scripts/cli/test_interfaces_l2tpv3.py:17.