Merge branch 'rook'

* rook:
  [rennes] Add DNS alias for Ceph monitors

data/grid5000/sites/rennes/servers/rook-storage0.json

 {
   "alias": [
-    "ceph"
+    "ceph1"
   ],
   "kind": "physical",
   "network_adapters": {

data/grid5000/sites/rennes/servers/rook-storage1.json

 {
   "alias": [
-
+    "ceph2"
   ],
   "kind": "physical",
   "network_adapters": {

data/grid5000/sites/rennes/servers/rook-storage3.json

 {
   "alias": [
-
+    "ceph0"
   ],
   "kind": "physical",
   "network_adapters": {

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

@@ -72,7 +72,7 @@ srv-bigdata:
 rook-storage0:
   kind: physical
   alias:
-    - ceph
+    - ceph1
   warranty: 2018-11
   serial: GQHZKZ1
   network_adapters:
@@ -83,7 +83,8 @@ rook-storage0:
 
 rook-storage1:
   kind: physical
-  alias: []
+  alias:
+    - ceph2
   warranty: 2018-11
   serial: GMG6LZ1
   network_adapters:
@@ -105,7 +106,8 @@ rook-storage2:
 
 rook-storage3:
   kind: physical
-  alias: []
+  alias:
+    - ceph0
   warranty: 2018-11
   serial: FQJ4LZ1
   network_adapters: