* 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 docker_swarm_service_info module
* Remove unused import
* Limit to retrieving info about one service
* Add exists return value
* Add yaml 3-dash
Co-Authored-By: hannseman <hannes@5monkeys.se>
* Document return value as jinja `none´
Co-Authored-By: hannseman <hannes@5monkeys.se>
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