* Fix ansible-test docker container detection.
* Attach test containers to the correct network.
* Do not assume `localhost` for accesing Docker.
* Look for containers on current network.
* Always map /var/run/docker.sock into containers.
This fixes issues when using a remote Docker host.
* Support container IP lookup from networks list.
* Fix container network attachment.
* Remove redundant container detection messages.
* Limit DOCKER_HOST parsing to TCP.
* Restore docker socket existence check.
The check is skipped if the docker hostname is not localhost.
* Correct changelog entry.
