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/docker_compose/aliases

@@ -2,5 +2,5 @@
 # GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-azp/4
+azp/6
 destructive

tests/integration/targets/docker_compose/meta/main.yml

@@ -4,5 +4,5 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 dependencies:
-  - setup_docker_compose
+  - setup_docker_compose_v1
   - setup_remote_tmp_dir