* Check minimal API and docker-py versions for all docker_* tests.
* Improve docker_swarm creation/destruction for tests.
* Fail when conditions aren't met.
* Don't hardcode address for advertise_addr.
* integration test for docker_swarm_service
* ensure stack de-initialization
* Set default value for 'configs' parameter to None
Docker-py uses None as a default value for configs.
Using the same default here allows to create services on older docker
setups (docker_api<1.30).
* Set default value for 'update_order' parameter to None
Docker-py uses None as a default value for update_order.
Using the same default here allows to create services on older docker
setups (docker_api<1.29)
* Set default value for 'publish.mode' parameter to None
Docker-py uses None as a default value for publish_mode.
Using the same default here allows to create services on older docker
setups (docker_api<1.32)
* Allow tests to run on older version of docker.
* remove workarounds for old docker versions
* test correct swarm cleanup
* changelog fragment for docker_swarm_service defaults change
