[nancy] retire cluster graphene bug10255

data/grid5000/sites/nancy/clusters/graphene/graphene.json

...5000/sites/nancy/clusters/graphene/nodes/graphene-10.json

...000/sites/nancy/clusters/graphene/nodes/graphene-100.json

...000/sites/nancy/clusters/graphene/nodes/graphene-101.json

...000/sites/nancy/clusters/graphene/nodes/graphene-102.json

...000/sites/nancy/clusters/graphene/nodes/graphene-103.json

...000/sites/nancy/clusters/graphene/nodes/graphene-104.json

...000/sites/nancy/clusters/graphene/nodes/graphene-105.json

...000/sites/nancy/clusters/graphene/nodes/graphene-106.json

...000/sites/nancy/clusters/graphene/nodes/graphene-107.json

...000/sites/nancy/clusters/graphene/nodes/graphene-108.json

...000/sites/nancy/clusters/graphene/nodes/graphene-109.json

...5000/sites/nancy/clusters/graphene/nodes/graphene-11.json

...000/sites/nancy/clusters/graphene/nodes/graphene-110.json

...000/sites/nancy/clusters/graphene/nodes/graphene-111.json

...000/sites/nancy/clusters/graphene/nodes/graphene-112.json

...000/sites/nancy/clusters/graphene/nodes/graphene-113.json

...000/sites/nancy/clusters/graphene/nodes/graphene-114.json

...000/sites/nancy/clusters/graphene/nodes/graphene-115.json

...000/sites/nancy/clusters/graphene/nodes/graphene-116.json