refine node label filter name

Signed-off-by: Wei Liu <wei.liu@zilliz.com>

proto/rg.proto

@@ -23,13 +23,13 @@ message ResourceGroupTransfer {
 }
 
 message ResourceGroupNodeFilter {
-  repeated common.KeyValuePair prefer_node_labels = 1; // node in resource group must match node labels requirements
+  repeated common.KeyValuePair node_labels = 1; // node in resource group must match node labels requirements
 }
 
 message ResourceGroupConfig {
   ResourceGroupLimit requests = 1; // requests node num in resource group, if node num is less than requests.nodeNum, it will be transfer from other resource group.
   ResourceGroupLimit limits = 2; // limited node num in resource group, if node num is more than limits.nodeNum, it will be transfer to other resource group.
   repeated ResourceGroupTransfer transfer_from = 3; // missing node should be transfer from given resource group at high priority in repeated list.
   repeated ResourceGroupTransfer transfer_to = 4; // redundant node should be transfer to given resource group at high priority in repeated list.
-  ResourceGroupNodeFilter node_filter = 5; // node in resource group must match node filters, otherwise node should be move out
+  ResourceGroupNodeFilter node_filter = 5; // node in resource group must match node filters
 }