Comment 3 for bug 1779721

My interpretation of the documentation was that an empty match entry matches everything. I changed the configuration to enforce the matching and it still fails:

```
root@ubuntu:~# cat /etc/netplan/01-netcfg.yaml
# This file describes the network interfaces available on your system
# For more information, see netplan(5).
network:
  version: 2
  renderer: networkd
  ethernets:
    all:
      match:
        name: ens*
      dhcp4: yes
root@ubuntu:~# networkctl
IDX LINK TYPE OPERATIONAL SETUP
  1 lo loopback carrier unmanaged
  2 ens6 ether degraded configuring

2 links listed.
root@ubuntu:~# networkctl status ens6
* 2: ens6
       Link File: /lib/systemd/network/99-default.link
    Network File: /run/systemd/network/10-netplan-all.network
            Type: ether
           State: degraded (configuring)
            Path: pci-0000:00:06.0
          Driver: virtio_net
          Vendor: Red Hat, Inc.
           Model: Virtio network device
      HW Address: 02:01:71:8f:cc:72
         Address: fe80::1:71ff:fe8f:cc72
root@ubuntu:~# cat /run/systemd/network/10-netplan-all.network
[Match]
Name=ens*

[Network]
DHCP=ipv4

[DHCP]
UseMTU=true
RouteMetric=100
root@ubuntu:~# journalctl -u systemd-networkd
Jul 03 08:52:33 ubuntu systemd[1]: Starting Network Service...
Jul 03 08:52:33 ubuntu systemd-networkd[447]: Enumeration completed
Jul 03 08:52:33 ubuntu systemd[1]: Started Network Service.
Jul 03 08:52:33 ubuntu systemd-networkd[447]: lo: Link is not managed by us
Jul 03 08:52:33 ubuntu systemd-networkd[447]: ens6: IPv6 successfully enabled
Jul 03 08:52:33 ubuntu systemd-networkd[447]: ens6: Gained carrier
Jul 03 08:52:35 ubuntu systemd-networkd[447]: ens6: Gained IPv6LL
```