[nantes][adminfront] Migrate adminfront and af CNAME to srv-3.nantes

data/grid5000/sites/nantes/servers/srv-3.json

 {
   "alias": [
-    "ntp"
+    "ntp",
+    "adminfront",
+    "af"
   ],
   "kind": "physical",
   "network_adapters": {

data/grid5000/sites/nantes/servers/srv.json

 {
-  "alias": [
-    "adminfront",
-    "af"
-  ],
   "kind": "physical",
   "network_adapters": {
     "bmc": {

input/grid5000/sites/nantes/servers/physical.yaml

 ---
 srv:
   kind: physical
-  alias: [adminfront, af]
   warranty: 2019-11
   serial: HP2YG5J
   network_adapters:
@@ -41,6 +40,8 @@ srv-3:
   kind: physical
   alias:
     - ntp
+    - adminfront
+    - af 
   warranty: 2026-04-25
   serial: 9TJRXW2
   network_adapters: