!7451 v2 ip: Treat IPv4 segment's lowest address as unicast

Merge Pull Request from: @ci-robot 
 
PR sync from: Liu Jian <liujian56@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/FIASTG5KRKSKMPJGGUR7PXWU7EWY2RSS/ 
 
https://gitee.com/openeuler/kernel/issues/I9PX8J 
 
Link:https://gitee.com/openeuler/kernel/pulls/7451

 

Reviewed-by: Yue Haibing <yuehaibing@huawei.com>
Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>