Discussed that upstream: The gist of it is:

--------- 8< --------------
if you want to be an early boot service, then you should use something like 
this:

    Before=sysinit.target

And that's all.

Inserting yourself between the sockets and the regular services (which your 
suggested deps do) is highly problematic, if you actually intend to make use of 
the sockets, as then you will make the system hang, as to fulfill your requests 
you need the services you are delaying...
--------- 8< --------------

So replacing cloud-init.service's

  Before=basic.target
  Before=dbus.socket

with

  Before=sysinit.target

should DTRT. dbus.socket (and all other sockets) will start after
sysinit.target as part of basic.target.

** Changed in: dbus (Ubuntu)
       Status: In Progress => Won't Fix

** Changed in: dbus (Ubuntu)
     Assignee: Martin Pitt (pitti) => (unassigned)

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https://bugs.launchpad.net/bugs/1629797

Title:
  resolve service in nsswitch.conf adds 25 seconds to failed lookups
  before systemd-resolved is up

Status in cloud-init:
  Fix Committed
Status in D-Bus:
  Unknown
Status in cloud-init package in Ubuntu:
  Fix Released
Status in dbus package in Ubuntu:
  Won't Fix

Bug description:
  During boot, cloud-init does DNS resolution checks to if particular
  metadata services are available (in order to determine which cloud it
  is running on).  These checks happen before systemd-resolved is up[0]
  and if they resolve unsuccessfully they take 25 seconds to complete.

  This has substantial impact on boot time in all contexts, because
  cloud-init attempts to resolve three known-invalid addresses ("does-
  not-exist.example.com.", "example.invalid." and a random string) to
  enable it to detect when it's running in an environment where a DNS
  server will always return some sort of redirect.  As such, we're
  talking a minimum impact of 75 seconds in all environments.  This
  increases when cloud-init is configured to check for multiple
  environments.

  This means that yakkety is consistently taking 2-3 minutes to boot on
  EC2 and GCE, compared to the ~30 seconds of the first boot and ~10
  seconds thereafter in xenial.

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