[nancy] Increase metrics period of gw and sgros{1,2}

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

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

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

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

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

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

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

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

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

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

data/grid5000/sites/nancy/network_equipments/gw.json

data/grid5000/sites/nancy/network_equipments/sgros1.json

data/grid5000/sites/nancy/network_equipments/sgros2.json

input/grid5000/sites/nancy/networks/gw-nancy.yaml

input/grid5000/sites/nancy/networks/sgros1.yaml

input/grid5000/sites/nancy/networks/sgros2.yaml