fix import

Author: HxpSerein

iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/manager/ConfigManager.java

@@ -19,6 +19,7 @@
 
 package org.apache.iotdb.confignode.manager;
 
+import org.apache.iotdb.common.rpc.thrift.Model;
 import org.apache.iotdb.common.rpc.thrift.TAINodeConfiguration;
 import org.apache.iotdb.common.rpc.thrift.TAINodeLocation;
 import org.apache.iotdb.common.rpc.thrift.TConfigNodeLocation;