Updated openstack/openstack
Project: openstack/nova  ca6a58166d128dfec62b9a299c2a88b3bea12487
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Docker cannot start a new instance because of an internal error

The root cause for the issue is that the Docker rest API does not
longer deliver the container list for v1.4 api calls.
The Docker API must be upgraded to 1.7.

Docker API 1.7 is a good choice since that is the first docker version
which officially supports rhel/centos.

In addition will docker client only parse json if the response needed
(to_json()) and this method will not catch json parse exception which makes
finding th eroot cause of a problem in the future easier.

Change-Id: I53dfac5f09ee021c6ed4763f7f164206e8ab32ff
Closes-Bug: #1278104