* Fix multiple subnet (of same IP version) idempotence for docker_network.
* Add changelog.
* Unit tests no longer make sense, since the part of the code they test has been removed.
* Re-add CIDR validation. Move it to better position (module setup instead of idempotence check).
* Update changelog.
* Only run new tests on VM test images.
* Actually do what is documented. Especially since an empty object is a valid value for aux_addresses.
* General test improvements.
* Adjust tests to older docker-py versions.
* docker_swarm_server_info: work around problems with older docker-py versions
* Bump minimal docker-py version for options network_filters and disk_usage.
* More general test improvements.
* Correct usage of docker_image.
* Put files into output directory.
* Speed up test.
* Remove old check.
* Add difference tracking tool
* Improve --diff mode for docker_container.
* Improve diffs of sets by ordering the sets.
* Rewrite imports, get rid of HAS_DOCKER_PY_x variables and use docker_version instead.
* Rename container -> active (more generic).
* Add --diff for docker_volume. Change old diff output.
* Add --diff for docker_network. Change old diff output.
* Add --diff for docker_swarm_service.
* Add changelog.
* Add entry for porting guide on docker_network and docker_volume.
