[log] Add file hierarchy for hardware intervention logs

log/grid5000/sites/lille/clusters/chiclet/nodes/chiclet-7.md

log/grid5000/sites/lille/clusters/chiclet/nodes/chiclet-8.md

...rid5000/sites/lille/clusters/chifflot/nodes/chifflot-1.md

...rid5000/sites/lille/clusters/chifflot/nodes/chifflot-2.md

...rid5000/sites/lille/clusters/chifflot/nodes/chifflot-3.md

...rid5000/sites/lille/clusters/chifflot/nodes/chifflot-4.md

...rid5000/sites/lille/clusters/chifflot/nodes/chifflot-5.md

...rid5000/sites/lille/clusters/chifflot/nodes/chifflot-6.md

...rid5000/sites/lille/clusters/chifflot/nodes/chifflot-7.md

...rid5000/sites/lille/clusters/chifflot/nodes/chifflot-8.md

...es/luxembourg/clusters/petitprince/nodes/petitprince-1.md

...s/luxembourg/clusters/petitprince/nodes/petitprince-10.md

...s/luxembourg/clusters/petitprince/nodes/petitprince-11.md

...s/luxembourg/clusters/petitprince/nodes/petitprince-13.md

...s/luxembourg/clusters/petitprince/nodes/petitprince-14.md

...s/luxembourg/clusters/petitprince/nodes/petitprince-15.md

...s/luxembourg/clusters/petitprince/nodes/petitprince-16.md

...es/luxembourg/clusters/petitprince/nodes/petitprince-2.md

...es/luxembourg/clusters/petitprince/nodes/petitprince-3.md

...es/luxembourg/clusters/petitprince/nodes/petitprince-5.md