[all_sites] network equipment metrics: Use 64bits counter when available

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

...grid5000/sites/lille/network_equipments/sw-chiclet-1.json

...grid5000/sites/lille/network_equipments/sw-chiclet-2.json

...grid5000/sites/lille/network_equipments/sw-chiclet-3.json

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

data/grid5000/sites/luxembourg/network_equipments/mxl1.json

data/grid5000/sites/luxembourg/network_equipments/mxl2.json

...sites/luxembourg/network_equipments/ul-grid5000-sw02.json

data/grid5000/sites/lyon/network_equipments/force10.json

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

data/grid5000/sites/lyon/network_equipments/salome.json

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

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

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

data/grid5000/sites/nancy/network_equipments/sgrisou1.json

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

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

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

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

...id5000/sites/nantes/network_equipments/ecotype-prod1.json