* Move docker_ module_utils into subpackage.
* Remove docker_ prefix from module_utils.docker modules.
* Adding jurisdiction for module_utils/docker to $team_docker.
* Making docker* unit tests community supported.
* Linting.
* Python < 2.6 is not supported.
* Refactoring docker-py version comments. Moving them to doc fragments. Cleaning up some indentations.
* More generic comparison code from docker_container to docker_common.
* More flexibility if a is None and method is allow_to_present.
Note that this odes not affect docker_container, as there a is never None.
* Update docker_secret and docker_config: simplify labels comparison.
* Added unit tests.
* Use proper subsequence test for allow_more_present for lists.
Note that this does not affect existing code in docker_container, since lists
don't use allow_more_present. Using allow_more_present will only be possible
in Ansible 2.8.
* pep8
