!906 ipv6: Add lwtunnel encap size of all siblings in nexthop calculation

Merge Pull Request from: @ci-robot 
 
PR sync from: Lu Wei luwei32@huawei.com https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/thread/P2VNBKLIL5YGSGNPIHF44HRLVST76J4E/ 
 
Link:https://gitee.com/openeuler/kernel/pulls/906

 

Reviewed-by: Jialin Zhang <zhangjialin11@huawei.com>
Reviewed-by: Yue Haibing <yuehaibing@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>