Comment 23 for bug 1664847

I test this, it work for macvlan.

networkd config
```
cat >/etc/networkd-dispatcher/routable.d/10-macvlan-interfaces.sh<<EOF
#! /bin/bash
ip link add macvlan0 link enp1s0 type macvlan mode bridge
ip link add macvlan1 link enp1s0 type macvlan mode bridge
EOF
chmod o+x,g+x,u+x /etc/networkd-dispatcher/routable.d/10-macvlan-interfaces.sh
```

netplan config

```
root@ubuntu:~# cat /etc/netplan/00-installer-config.yaml
network:
  ethernets:
    enp1s0:
      dhcp4: false
      addresses:
        - 172.16.10.10/24
      nameservers:
        addresses:
          - 223.5.5.5
          - 223.6.6.6
      routes:
        - to: default
          via: 172.16.10.1
    macvlan0:
      addresses:
        - 172.16.10.11/24
    macvlan1:
      addresses:
        - 172.16.10.12/24
  version: 2
```

apply
```
netplan apply
```

check macvlan interface

```
root@ubuntu:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 7c:b5:9b:59:0a:71 brd ff:ff:ff:ff:ff:ff
    inet 172.16.10.10/24 brd 172.16.10.255 scope global enp1s0
       valid_lft forever preferred_lft forever
13: macvlan0@enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 32:e8:b4:0a:47:62 brd ff:ff:ff:ff:ff:ff
    inet 172.16.10.11/24 brd 172.16.10.255 scope global macvlan0
       valid_lft forever preferred_lft forever
    inet6 fe80::30e8:b4ff:fe0a:4762/64 scope link
       valid_lft forever preferred_lft forever
14: macvlan1@enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether d2:73:75:14:b2:04 brd ff:ff:ff:ff:ff:ff
    inet 172.16.10.12/24 brd 172.16.10.255 scope global macvlan1
       valid_lft forever preferred_lft forever
    inet6 fe80::d073:75ff:fe14:b204/64 scope link
       valid_lft forever preferred_lft forever
```