tree 624eeb49b55dee291c4151dad8d53a8fee790073
parent 127a24bfd495e610502f1fed30c0f9810d0a73fb
author Jian Zhang <zhangjian.3032@bytedance.com> 1688453320 +0800
committer Jian Zhang <zhangjian.3032@bytedance.com> 1688468937 +0800

fix set ipv4 netmask failed

Before `createIfAddr`, we accept the address is nullopt when set the
ipv4 netmask,

so, if the address is not null, check the address is `0.0.0.0`,
if null, use the `ifaddr->address`.

Tested:
1. Set netmask.
~# ipmitool lan set 1 netmask 255.255.255.0

2. Check the netmask.
~# ipmitool lan print 1 | grep -i sub
Subnet Mask             : 255.255.255.0

Signed-off-by: Jian Zhang <zhangjian.3032@bytedance.com>
Change-Id: I7b5967cb8c00bc9a1507c04df06e7898478b079f