op-mode: T7538: remove the obsolete "show login level" command

[dmbaturin]

Change summary

The old command run show login level is a legacy of the Vyatta days: it uses an implementation detail of the old scripts to determine if the current user is an admin or an operator, and also assumes that admin/operator distinctions are binary.

It's effectively useless now and will break when we introduce the new op mode permissions system, so we should remove it.

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): legacy functionality removal.

Related Task(s)

Related PR(s)

How to test / 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]

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

[sever-sever]

We are not having levels at the moment

[c-po]

We no longer have login levels