Yu Watanabe
371005ac98
When a [SR-IOV] section has no setting, e.g.
```ini
[SR-IOV]
VirtualFunction=0
```
then the kernel previously replied -EINVAL, as we send a rtnl message
with an empty IFLA_VF_INFO container.
See See do_setvfinfo() in net/core/rtnetlink.c of the kernel.
When a [SR-IOV] section that has an unsupported settings by the
interface driver, then previously the kernel partially applied
settings and returned -EOPNOTSUPP. E.f.
```ini
[SR-IOV]
VirtualFunction=0
LinkState=auto
Trust=true
MACAddress=02:01:00:3e:61:34
```
and the interface does not support configuring the link state, then
the MAC address is assigned, but the trust is not applied:
```
enp3s0f0: Failed to configure SR-IOV virtual function 0, ignoring: Operation not supported
vf 0 link/ether 02:01:00:3e:61:34 brd ff:ff:ff:ff:ff:ff, spoof checking on, link-state auto, trust off
```
To fix such issues, this makes networkd/udevd send each attribute
for VF one-by-one.
Fixes #37257 and #37275.
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