Integration tests: split up Docker setup, move docker_compose tests into own group (#718)

* Rename setup role.

* Create new CI group 6, and move docker_compose v1 tests into there.

* Split up Docker setup in integration tests.

* Change setup_docker_compose_v1 to install its own Docker SDK for Python.

* Docker SDK for Python not needed to set up registry or query host info.

tests/integration/targets/setup_docker/defaults/main.yml

@@ -5,7 +5,6 @@
 
 docker_cli_version: '0.0'
 docker_api_version: '0.0'
-docker_py_version: '0.0'
 docker_skip_cleanup: true
 docker_prereq_packages: []
 docker_packages:
@@ -13,10 +12,6 @@ docker_packages:
 docker_cli_packages:
   - docker-ce-cli
 
-docker_pip_extra_packages: []
-docker_pip_package: docker
-docker_pip_package_limit: ''
-
 docker_cleanup_packages:
   - docker
   - docker-ce