Big fixes

[metal3d]

• Make the "print-config" as subcommand
• Config file is now read correctly
• Fixes bad method to read slices from config
• Others fixes

[github-actions[bot]]

:arrow_down: Go test coverage decreased from 87.7% to 84.9% compared to 42304a6f990da4109f16171945d60d442eceaf30 Updated Package Coverages: ```diff # Package Name | Prior | New + github.com/metal3d/goreorder/cmd/goreorder | 0.0% | 70.1% + github.com/metal3d/goreorder/log | 0.0% | 83.3% + github.com/metal3d/goreorder/ordering | 87.7% | 91.5% ```

View coverage for all packages

```diff # Package Name | Coverage + github.com/metal3d/goreorder/cmd/goreorder | 70.1% + github.com/metal3d/goreorder/log | 83.3% + github.com/metal3d/goreorder/ordering | 91.5% ```