T7076: Fix for script that validates ethernet interface

[natali-rs1985]

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/T7076

Related PR(s)

How to test / Smoketest result

vyos@vyos# ${vyos_validators_dir}/ethernet-interface eth5
Error: eth5 interface does not exist in the system
[edit]
vyos@vyos# ${vyos_validators_dir}/ethernet-interface dum3
Error: dum3 is not an ethernet interface
[edit]
vyos@vyos# ${vyos_validators_dir}/ethernet-interface eth1
[edit]

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]

CI integration 👍 passed!

Details

CI logs

• CLI Smoketests (no interfaces) 👍 passed
• CLI Smoketests (interfaces only) 👍 passed
• Config tests 👍 passed
• RAID1 tests 👍 passed
• TPM tests 👍 passed