fix: change action type from oneof to enum

Author: dalaoqi

hack/cmds/commands.json

@@ -6041,7 +6041,7 @@
       },
       {
         "name": "action",
-        "type": "oneof",
+        "type": "enum",
         "enum": ["KEEPREF", "DELREF", "ACKED"],
         "optional": true
       },