[luxembourg][vianden] Set correct disk by_path property

data/grid5000/sites/luxembourg/clusters/vianden/nodes/vianden-1.json

@@ -105,9 +105,9 @@
   "storage_devices": [
     {
       "by_id": "",
-      "by_path": "/dev/disk/by-path/dummy",
+      "by_path": "/dev/disk/by-path/pci-0000:18:00.0-nvme-1",
       "id": "disk0",
-      "interface": "SAS",
+      "interface": "NVME",
       "model": "unknown",
       "size": 8,
       "storage": "SSD",

input/grid5000/sites/luxembourg/clusters/vianden/vianden.yaml

@@ -31,8 +31,8 @@ nodes:
     storage_devices:
       disk0: # This field will have to be renamed later.
         id: disk0
-        interface: SAS
-        by_path: "/dev/disk/by-path/dummy" # this path will have to change later.
+        interface: NVME
+        by_path: "/dev/disk/by-path/pci-0000:18:00.0-nvme-1"
     software:
       standard-environment: debian11-x64-std
     management_tools: