添加配置，当删除用户时是否保留用户昵称

broker/src/main/java/io/moquette/spi/IMessagesStore.java

@@ -150,7 +150,7 @@ public interface IMessagesStore {
 
     ErrorCode updateUserInfo(InputOutputUserInfo userInfo, int flag);
     void addUserInfo(WFCMessage.User user, String password) throws Exception;
-    void destoryUser(String userId);
+    void destroyUser(String userId);
     void updateUserInfo(WFCMessage.User user) throws Exception;
     WFCMessage.User getUserInfo(String userId);
     WFCMessage.User getUserInfoByName(String name);