[nancy] graphite - Add rate to graphite-2 interface

data/grid5000/sites/nancy/clusters/graphite/nodes/graphite-2.json

@@ -86,7 +86,7 @@
       "management": false,
       "mountable": true,
       "mounted": false,
-      "rate": null,
+      "rate": 1000000000,
       "switch": "sgraphene4",
       "switch_port": "GigabitEthernet1/0/46",
       "vendor": "intel",

generators/input/sites/nancy/clusters/graphite_generated.yaml

@@ -211,6 +211,7 @@ graphite-2:
       management: false
       mounted: false
       mac: b8:ca:3a:69:1e:8d
+      rate: 1000000000
       driver: igb
       enabled: true
       mountable: true