sysconfig rendering ignores vlan name

[Scott Moser]

sysconfig rendering currently just does not pay attention to the vlan
device's name. Instead it attempts to set the name to the backing
device with .* stripped from the end.

Here is an example of current master output.
The 'PHYSDEV' entry should be 'eth0', not 'infra'.

$ cat my2.yaml
version: 2
ethernets:
  eth0:
    addresses: ["192.10.1.2/24"]
    match:
       macaddress: "00:16:3e:60:7c:df"
vlans:
  infra0:
    id: 1001
    link: eth0
    addresses: ["10.0.1.2/16"]

$ tox-venv py3 python3 -m cloudinit.cmd.main devel net-convert \
  --mac en0,00:16:3e:60:7c:df \
  --network-data=my2.yaml --kind=yaml \
  --distro=centos --output-kind=sysconfig \
  --directory=out.test

$ cat out.test/etc/sysconfig/network-scripts/ifcfg-eth0
# Created by cloud-init on instance boot automatically, do not edit.
#
BOOTPROTO=none
DEVICE=eth0
HWADDR=00:16:3e:60:7c:df
IPADDR=192.10.1.2
NETMASK=255.255.255.0
NM_CONTROLLED=no
ONBOOT=yes
STARTMODE=auto
TYPE=Ethernet
USERCTL=no

$ cat out.test/etc/sysconfig/network-scripts/ifcfg-infra0
# Created by cloud-init on instance boot automatically, do not edit.
#
BOOTPROTO=none
DEVICE=infra0
IPADDR=10.0.1.2
NETMASK=255.255.0.0
NM_CONTROLLED=no
ONBOOT=yes
PHYSDEV=infra
STARTMODE=auto
TYPE=Ethernet
USERCTL=no
VLAN=yes

[Chad Smith (chad.smith)]

This bug is believed to be fixed in cloud-init in version 20.4. If this is still a problem for you, please make a comment and set the state back to New

Thank you.

[James Falcon (falcojr)]

Tracked in Github Issues as https://github.com/canonical/cloud-init/issues/3373