cli: T6740: add a converter from set commands to config

[dmbaturin]

Change Summary

Add new utility vyos-commands-to-config that converts set commands to configs suitable for loading.

Whether we want a CLI completion for it is an open question.

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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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]

✅ No issues found in unused-imports check.. Please refer the workflow run

[jestabro]

The following concerns may be purely cosmetic, but it is a timely reminder that we are still relying on the legacy loader and parser to provide:
(1) setting tag data
(2) ordering of nodes

We have explicit mechanisms for both, and if one wants the result of the converter to provide a stand alone config rendered with respect to those constraints, the following patch illustrates the idea:
088fa9a

The approach to (1) there is reasonable and provides a utility that may be otherwise useful to set all tag data long a path; the approach to (2) is a hack by simply reading and re-rendering the result --- we currently order nodes when parsing, not rendering, as we haven't had need of the latter (other than an optional ordering of values for unittests).

It is the author's discretion as to whether we should bother with cosmetic parity for the output.

[github-actions]

CI integration ❌ failed!

Details

CI logs

• CLI Smoketests (no interfaces) ❌ failed
• CLI Smoketests (interfaces only) ❌ failed
• Config tests ❌ failed
• RAID1 tests ❌ failed
• TPM tests ❌ failed