Added VO to the StorageClass Ls Item

eos_cta/protobuf/cta_admin.proto

@@ -434,9 +434,10 @@ message StorageClassLsItem {
   string disk_instance                      = 1;
   string name                               = 2;
   uint64 nb_copies                          = 3;
-  cta.common.EntryLog creation_log          = 4;
-  cta.common.EntryLog last_modification_log = 5;
-  string comment                            = 6;
+  string vo                                 = 4;
+  cta.common.EntryLog creation_log          = 5;
+  cta.common.EntryLog last_modification_log = 6;
+  string comment                            = 7;
 }
 
 message TapeLsItem {