docker_container: simplify minimal required version per option handling (#47711)

* Store parsed docker-py / docker API versions in client.

* Began refactoring 'minimal required version' for docker_container options.

* Removing some fake defaults.

* Added changelog.

* Improve tests (check older docker versions).

* Fix comparison. The breaking point is not docker-py 2.0.0, but 1.10.0.

(Verified by testing with these versions.)

* Move docker-py/API version detection to setup_docker.

* Add YAML document starter.

* docker_network requirement for docker-py was bumped to 1.10.0 in #47492.

test/integration/targets/setup_docker/tasks/main.yml

@@ -17,3 +17,21 @@
         state: present
         name: 'docker{{ extra_packages }}'
         extra_args: "-c {{ role_path }}/../../../runner/requirements/constraints.txt"
+
+    # Detect docker API and docker-py versions
+    - name: Check Docker API version
+      command: "{{ ansible_python.executable }} -c 'import docker; print(docker.from_env().version()[\"ApiVersion\"])'"
+      register: docker_api_version_stdout
+      ignore_errors: yes
+
+    - name: Check docker-py API version
+      command: "{{ ansible_python.executable }} -c 'import docker; print(docker.__version__)'"
+      register: docker_py_version_stdout
+      ignore_errors: yes
+
+    - set_fact:
+        docker_api_version: "{{ docker_api_version_stdout.stdout or '0.0' }}"
+        docker_py_version: "{{ docker_py_version_stdout.stdout or '0.0' }}"
+
+    - debug:
+        msg: "Docker API version: {{ docker_api_version }}; docker-py library version: {{ docker_py_version }}"