Comment 1 for bug 1532167

I think the minimal fix we need for 1.25 is to have the following /e/n/i after the script:

iface eth0 inet manual

auto juju-br0
iface juju-br0 inet static
    gateway 10.20.19.2
    address 10.20.19.103/24
    mtu 1500
    bridge_ports eth0

auto eth0.100
iface eth0.100 inet static
    address 10.100.19.103/24
    vlan-raw-device eth0
    mtu 1500
    vlan_id 100

auto eth0.250
iface eth0.250 inet static
    address 10.250.19.103/24
    vlan-raw-device eth0
    mtu 1500
    vlan_id 250

auto eth0.50
iface eth0.50 inet static
    address 10.50.19.103/24
    vlan-raw-device eth0
    mtu 1500
    vlan_id 50

dns-nameservers 10.10.19.2
dns-search maas-19