dragonball: config_manager: preserve device when update

DeviceConfigInfo contains config and device, so when we want to do
update we could simply update config part of the info, and device would
not be changed during update.

Fixes: #6324

Signed-off-by: Helin Guo <helinguo@linux.alibaba.com>

src/dragonball/src/config_manager.rs

@@ -231,7 +231,7 @@ where
                         info.config.check_conflicts(config)?;
                     }
                 }
-                self.info_list[index] = device_info;
+                self.info_list[index].config = config.clone();
                 index
             }
             None => {