It appears that the networkd in Xenial is sensitive to dbus service
being available; it times out a bit waiting for dbus before continuing;
this is the delay.

If I drop cloud-init.service 'Before=dbus.socket' and
'Before=basic.target'; Add 'After=systemd-networkd-wait-online.service';
then ensure that we have a symlink to systemd-networkd.service and
systemd-networkd-wait-online.service in /etc/systemd/system/network-
online.target.wants/  then I can get reliable service; networkd comes
up, waits for eth0 to DHCP, then when complete, cloud-init init runs and
eth0 is up.

This of course diverges cloud-init.service from trunk;

Ideally we'd be able to run networkd without dbus *and* without
timeouts.

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https://bugs.launchpad.net/bugs/1636912

Title:
  systemd-networkd runs too late for cloud-init.service (net)

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