Docker 1.11.0 is unable to activate kuryr when docker plugin spec uses json

[Frederick F. Kautz IV]

A full writeup is here:

https://github.com/docker/docker/issues/22175

In short, we can work around this by replacing the .json spec file with a .spec file.

[Antoni Segura Puimedon (celebdor)]

Docker 1.11.1 fixes it, but we'll take https://review.openstack.org/#/c/309104/ once comments are addressed.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/309104
Committed: https://git.openstack.org/cgit/openstack/kuryr/commit/?id=07dca2a49ba1d127e1ca67463783e1f92346e1af
Submitter: Jenkins
Branch: master

commit 07dca2a49ba1d127e1ca67463783e1f92346e1af
Author: Frederick F. Kautz IV <email address hidden>
Date: Thu Apr 21 18:15:56 2016 -0700

    Activate libnetwork plugin with .spec instead of .json

    Docker 1.11.0 fails to activate libnetwork plugins specified with .json files.
    Using .spec files still works. Adding a .spec file and configuring devstack to
    work around the bug.

    Change-Id: I041a5e9a526c2e63c92f3d01411afda8b7beb601
    Closes-Bug: #1572369
    Signed-off-by: Frederick F. Kautz IV <email address hidden>