[nancy][grostiti] fix ib0 rate

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

@@ -404,7 +404,7 @@
       "mountable": false,
       "mounted": false,
       "name": "ib0",
-      "rate": 10000000000,
+      "rate": 56000000000,
       "vendor": "Mellanox Technologies"
     },
     {

input/grid5000/sites/nancy/clusters/grostiti/nodes/grostiti-1.yaml

@@ -223,7 +223,7 @@ grostiti-1:
       management: false
       model: MT27500 Family [ConnectX-3]
       name: ib0
-      rate: 10000000000
+      rate: 56000000000
       vendor: Mellanox Technologies
     ib1:
       driver: hfi1