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_python_deps/vars/RedHat-7.yml

@@ -0,0 +1,10 @@
+---
+# Copyright (c) Ansible Project
+# 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
+
+docker_pip_api_packages:
+  # Not sure why RHEL7 needs this specific version of requests
+  - requests==2.6.0
+  # - paramiko
+  # - pyOpenSSL

tests/integration/targets/setup_docker_python_deps/vars/Ubuntu-14.yml

@@ -0,0 +1,11 @@
+---
+# Copyright (c) Ansible Project
+# 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
+
+docker_pip_api_packages:
+  # Installing requests >=2.12.0 on Ubuntu 14.04 breaks certificate validation. We restrict to an older version
+  # to ensure out get_url tests work out fine. This is only an issue if pyOpenSSL is also installed.
+  - requests==2.6.0
+  # - paramiko
+  # - pyOpenSSL

tests/integration/targets/setup_docker_python_deps/vars/default.yml

@@ -0,0 +1,4 @@
+---
+# Copyright (c) Ansible Project
+# 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