I could not see the docker failure when running a local ADT test. So I
added the checking with some additional output to see what is going on.
The latest test failure (at least now it is detected quickly)
http://autopkgtest.ubuntu.com/packages/u/ubuntu-fan/artful/amd64 shows
that the host side is ok (using systemd-resolve --status on the first
default route found returns a sensible forwarder). Also the fact that
the image can be downloaded hints that the host side is good. And the
LXD test is using the same setup (also the same underlay of
10.220.0.0/16) and works.

The difference is that LXD is using the dnsmasq based resolver which the
fan tools set up, while docker is using its own (127.0.0.11) service.
Not sure what the exact environment setup in ADT testing is, but could
docker be affected by the same multiple default route issue which we had
with the LXD tests? I don't think fanatic can do much as dns does not
seem to be something one can influence with network create.

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https://bugs.launchpad.net/bugs/1718548

Title:
  ubuntu-fan autopkgtests are broken against systemd-resolved

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