Implement occ status command via return codes v2 (Fixes: #35704)

[leegarrett]

Signed-off-by: Lee Garrett [email protected]

• Resolves: #35704

Summary

This is an improved version of my earlier PR #35830. This is now a parameter to status, so it allows for adding more return codes later, which can then for example be consumed in systemd units, or monitoring checks.

It adds a parameter that can be used in scripts. ./occ status -e returns 0 when operating normally, and 1 if there is maintenance mode, 2 if ./occ upgrade is required.

TODO

• [ ] Test coverage?

Checklist

• [x] Code is properly formatted
• [x] Sign-off message is added to all commits
• [ ] Tests (unit, integration, api and/or acceptance) are included
• [ ] Screenshots before/after for front-end changes
• [ ] Documentation (manuals or wiki) has been updated or is not required
• [ ] Backports requested where applicable (ex: critical bugfixes)