[rennes] modules migration from srv-bigdata to srv-data2

data/grid5000/sites/rennes/servers/srv-bigdata.json

 {
   "alias": [
-    "storage",
-    "modules"
+    "storage"
   ],
   "kind": "physical",
   "network_adapters": {

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

 {
   "alias": [
-    "storage2"
+    "storage2",
+    "modules"
   ],
   "group_storage": {
     "name": "storage2",

input/grid5000/sites/rennes/servers/servers.yaml

@@ -16,7 +16,6 @@ srv-bigdata:
   kind: physical
   alias:
     - storage
-    - modules
   warranty: 2018-10
   serial: 6V9FGZ1
   network_adapters:
@@ -198,7 +197,9 @@ srv-data:
 
 srv-data2:
   kind: physical
-  alias: [storage2]
+  alias:
+    - storage2
+    - modules
   warranty: 2008-05
   serial: CZ23160DF7
   network_adapters: