Order all keys in config (#8541)

New changes

- return default values when sub-sys is
  not configured.
- state is hidden parameter now
- remove worm mode to be saved in config

cmd/config/storageclass/storage-class.go

@@ -59,10 +59,18 @@ const (
 // DefaultKVS - default storage class config
 var (
 	DefaultKVS = config.KVS{
-		config.State:   config.StateOff,
-		config.Comment: "This is a default StorageClass configuration, only applicable in erasure coded setups",
-		ClassStandard:  "",
-		ClassRRS:       "EC:2",
+		config.KV{
+			Key:   config.State,
+			Value: config.StateOff,
+		},
+		config.KV{
+			Key:   ClassStandard,
+			Value: "",
+		},
+		config.KV{
+			Key:   ClassRRS,
+			Value: "EC:2",
+		},
 	}
 )