[log] Add file hierarchy for hardware intervention logs

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-28.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-29.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-3.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-30.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-31.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-32.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-4.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-5.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-6.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-7.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-8.md

log/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-9.md

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

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

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

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

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

log/grid5000/sites/grenoble/clusters/drac/nodes/drac-3.md

log/grid5000/sites/grenoble/clusters/drac/nodes/drac-4.md

log/grid5000/sites/grenoble/clusters/drac/nodes/drac-5.md