Properties for device type vlans

Properties for device type vlans:

id (scalar)

VLAN ID, a number between 0 and 4094.

link (scalar)

netplan ID of the underlying device definition on which this VLAN gets
created.

Example:

ethernets:
  eno1: {...}
vlans:
  en-intra:
    id: 1
    link: eno1
    dhcp4: yes
  en-vpn:
    id: 2
    link: eno1
    addresses: ...