[grenoble] servers - Fix storage naming

data/grid5000/sites/grenoble/servers/dignfs.json

 {
   "alias": [
-    "storage1"
+
   ],
   "group_storage": {
     "name": "storage1",

data/grid5000/sites/grenoble/servers/srv-data.json

@@ -4,7 +4,7 @@
     "public",
     "home-g5k",
     "modules",
-    "storage2"
+    "storage1"
   ],
   "kind": "physical",
   "network_adapters": {

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

 {
   "alias": [
-    "storage3"
+    "storage2"
   ],
   "kind": "physical",
   "network_adapters": {

data/grid5000/sites/grenoble/servers/srv-data3.json

 {
   "alias": [
-    "storage4"
+    "storage3"
   ],
   "kind": "physical",
   "network_adapters": {

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

@@ -57,7 +57,7 @@ digwatt:
 
 dignfs:
   kind: physical
-  alias: [storage1]
+  alias: []
   warranty: 2025-10-06
   serial: 57JV173
   network_adapters:
@@ -107,7 +107,7 @@ srv-data:
   kind: physical
   warranty: 2031-07-21
   serial: CZ24280F8D
-  alias: [nfs, public, home-g5k, modules, storage2]
+  alias: [nfs, public, home-g5k, modules, storage1]
   network_adapters:
     default:
       ip: 172.16.31.15
@@ -122,7 +122,7 @@ srv-data2:
   kind: physical
   warranty: 2031-07-21
   serial: CZ24280F8F
-  alias: [storage3]
+  alias: [storage2]
   network_adapters:
     default:
       ip: 172.16.31.16
@@ -137,7 +137,7 @@ srv-data3:
   kind: physical
   warranty: 2031-07-04
   serial: CZ24250CWJ
-  alias: [storage4]
+  alias: [storage3]
   network_adapters:
     default:
       ip: 172.16.31.17