network,udev: configure SR-IOV VF attribute one-by-one

network,udev: configure SR-IOV VF attribute one-by-one

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.