[luxembourg] Add physical server config for srv-data2

New NFS server hosted in Belval CDC

data/grid5000/sites/luxembourg/servers/srv-data2.json

+{
+  "alias": [
+    "srv-data-belval"
+  ],
+  "kind": "physical",
+  "network_adapters": {
+    "bmc": {
+      "ip": "172.17.190.80",
+      "mac": "c4:cb:e1:cc:79:f0"
+    },
+    "default": {
+      "ip": "172.16.191.80"
+    }
+  },
+  "redfish": true,
+  "serial": "CSQXL44",
+  "type": "server",
+  "uid": "srv-data2",
+  "warranty": "2029-07"
+}
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