Janne Heß b52372675d nixos/switch-to-configuration: Clean up lower part of the script ...

- Fully get rid of `parseKeyValues` and use systemctl features for that
- Add some regex modifiers recommended by perlcritic
- Get rid of a postfix if
- Sort units when showing their status
- Clean the logic for showing what failed from `elif` to `next`
- Switch from `state` to `substate` for `auto-restart` because that's
  actually where the value is stored
- Show status of units with one single systemctl call and get rid of
  COLUMNS in favor of --full
- Add a test for failing units

2022-01-20 17:10:02 +01:00

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