[luxembourg][pve] Add physical servers config for pve-{1,2}

data/grid5000/sites/luxembourg/servers/pve-1.json

+{
+  "kind": "physical",
+  "network_adapters": {
+    "adm": {
+      "ip": "172.17.191.3"
+    },
+    "bmc": {
+      "ip": "172.17.190.3",
+      "mac": "70:b5:e8:e2:8a:14"
+    },
+    "default": {
+      "ip": "172.16.191.3",
+      "mac": "78:ac:44:18:22:a8"
+    }
+  },
+  "serial": "3Q4TD93",
+  "type": "server",
+  "uid": "pve-1",
+  "warranty": "2025-12-18"
+}
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