[log] Add file hierarchy for hardware intervention logs

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-1.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-10.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-11.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-12.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-13.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-14.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-15.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-16.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-17.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-18.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-19.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-2.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-20.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-21.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-22.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-23.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-24.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-25.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-26.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-27.md