[rennes][ceph-devel] Add DHCP and DNS configuration

data/grid5000/sites/rennes/servers/ceph-devel-1.json

+{
+  "alias": [
+
+  ],
+  "kind": "physical",
+  "network_adapters": {
+    "bmc": {
+      "ip": "172.17.111.71",
+      "mac": "4c:d9:8f:12:8a:58"
+    },
+    "default": {
+      "ip": "172.16.111.71",
+      "mac": "E4:43:4B:39:6A:10"
+    }
+  },
+  "redfish": true,
+  "serial": "FN5S2S2",
+  "type": "server",
+  "uid": "ceph-devel-1",
+  "warranty": "2025-11"
+}
\ No newline at end of file