[Bug 1487936] [NEW] $DOCKER_OPTS missing in systemd's docker.service

[brainstorm]

Public bug reported:

While creating a docker-swarm master and nodes on top of a openstack
cluster running Ubuntu 15.04 images, I ran into the problem that my
local docker-machine client was unable to connect to swarm-master and
nodes post-instantiation, here's the reason and solution:

https://github.com/maclennann/docker/commit/0e7fb272d6ce8e2

If this patch is not applied, a local docker client cannot connect to
the remote docker daemon:

root     11931  2.3  0.1 381472 24584 ?        Ssl  01:59   0:00
/usr/bin/docker daemon -H fd://

As opposed to what it should be with correctly expanded $DOCKER_OPTS:

root     12081  8.5  0.1 512544 24628 ?        Ssl  02:00   0:00
/usr/bin/docker daemon --tlsverify --tlscacert=/etc/docker/ca.pem
--tlskey=/etc/docker/server-key.pem --tlscert=/etc/docker/server.pem
--label=provider=openstack --host=unix:///var/run/docker.sock
--host=tcp://0.0.0.0:2376 -H fd://

Please note that *both* docker.service and /etc/default/docker should be
modified in docker.io package.

** Affects: docker.io (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: systemd-boot

** Summary changed:

- $DOCKER_OPTS missing systemd's docker.service
+ $DOCKER_OPTS missing in systemd's docker.service

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https://bugs.launchpad.net/bugs/1487936

Title:
  $DOCKER_OPTS missing in systemd's docker.service

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