githooks/prepare-commit-msg: add systemd prefixes

Extend the hook to automatically make useful titles for packages in systemd directories. We had two styles for modifying the systemd package itself, either "systemd/systemd:" or "systemd:". Pick the shorter one.

added systemd label

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Hell, yeah!

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approved this merge request

added 3 commits

• d2035418 - githooks/prepare-commit-msg: refactor case...esac
• e6bda25a - githooks/prepare-commit-msg: add systemd prefixes
• de11b066 - COMMITSTYLE: update for systemd directory

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enabled an automatic merge when all merge checks for de11b066 pass

merged