Comment 6 for bug 1912844

The network config below closely reproduces the issue when a LXD VM is launched with it, has openvswitch-switch installed on it (e.g. via a manual DHCP on enp5s0), and is `cloud-init clean --logs --reboot`ed.

The log does not contain the error message, but calling `cloudinit.net.get_interfaces_by_mac()` from a Python console does trigger it.

If the vlans definition is removed, the instance comes up with networking (after the same reboot process).

MAC_ADDRESS = "de:ad:be:ef:12:34"
NETWORK_CONFIG = """\
bonds:
    bond0:
        interfaces:
            - enp5s0
        macaddress: {0}
        mtu: 1500
bridges:
        ovs-br:
            interfaces:
            - bond0
            macaddress: {0}
            mtu: 1500
            openvswitch: {{}}
ethernets:
    enp5s0:
      mtu: 1500
      set-name: enp5s0
      match:
          macaddress: {0}
version: 2
vlans:
  ovs-br.100:
    dhcp4: true
    id: 100
    link: ovs-br
    mtu: 1500
""".format(MAC_ADDRESS)