Cosmetic: consistent spacing when displaying MOTD

[igorpecovnik]

Summary

This PR makes the Armbian MOTD consistent and modular regardless of which /etc/update-motd.d/* scripts are enabled.

Highlights

• deterministic spacing: exactly one blank line appears before
• move ip, AP and container info in separate script
• vnStat formatting: drops decimals (205.88 MiB → 205 MiB) and ensures spacing between number and unit.
• Temperature formatting: board/ambient temps truncated to integers (37.6°C → 37°C).
• Tips compact: prints on its own line if something printed before; no trailing blank line; works even without jq or quotes.txt.
• Containers spacing: prints no blank lines; only sets the “after-header” stamp for sysinfo.

How Has This Been Tested?

• Manual tests displaying single and multiple items (driven via armbian-config)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch motd

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[SuperKali]

Update: reviewing right now

[github-actions]

✅ This PR has been reviewed and approved — all set for merge!

[SuperKali]

[SuperKali]

@igorpecovnik all show correctly except ap-info

[igorpecovnik]

ap-info

That is present only if AP runs on it, not in STA mode.