[nancy][gros] Generate JSON files in data directory

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

data/grid5000/sites/nancy/clusters/gros/nodes/gros-1.json

data/grid5000/sites/nancy/clusters/gros/nodes/gros-10.json

data/grid5000/sites/nancy/clusters/gros/nodes/gros-100.json

data/grid5000/sites/nancy/clusters/gros/nodes/gros-101.json

data/grid5000/sites/nancy/clusters/gros/nodes/gros-102.json

data/grid5000/sites/nancy/clusters/gros/nodes/gros-103.json

data/grid5000/sites/nancy/clusters/gros/nodes/gros-104.json

data/grid5000/sites/nancy/clusters/gros/nodes/gros-105.json

data/grid5000/sites/nancy/clusters/gros/nodes/gros-106.json

data/grid5000/sites/nancy/clusters/gros/nodes/gros-107.json

data/grid5000/sites/nancy/clusters/gros/nodes/gros-108.json

data/grid5000/sites/nancy/clusters/gros/nodes/gros-109.json

data/grid5000/sites/nancy/clusters/gros/nodes/gros-11.json

data/grid5000/sites/nancy/clusters/gros/nodes/gros-110.json

data/grid5000/sites/nancy/clusters/gros/nodes/gros-111.json

data/grid5000/sites/nancy/clusters/gros/nodes/gros-112.json

data/grid5000/sites/nancy/clusters/gros/nodes/gros-113.json

data/grid5000/sites/nancy/clusters/gros/nodes/gros-114.json

data/grid5000/sites/nancy/clusters/gros/nodes/gros-115.json