docker modules: various adjustments (#51700)

* Move docker_ module_utils into subpackage.

* Remove docker_ prefix from module_utils.docker modules.

* Adding jurisdiction for module_utils/docker to $team_docker.

* Making docker* unit tests community supported.

* Linting.

* Python < 2.6 is not supported.

* Refactoring docker-py version comments. Moving them to doc fragments. Cleaning up some indentations.

lib/ansible/modules/cloud/docker/docker_host_facts.py

@@ -91,23 +91,15 @@ options:
     type: bool
     default: no
 extends_documentation_fragment:
-    - docker
+  - docker
+  - docker.docker_py_1_documentation
 
 author:
-    - Piotr Wojciechowski (@WojciechowskiPiotr)
+  - Piotr Wojciechowski (@WojciechowskiPiotr)
 
 requirements:
-    - "python >= 2.6"
-    - "docker-py >= 1.10.0"
-    - "Please note that the L(docker-py,https://pypi.org/project/docker-py/) Python
-       module has been superseded by L(docker,https://pypi.org/project/docker/)
-       (see L(here,https://github.com/docker/docker-py/issues/1310) for details).
-       For Python 2.6, C(docker-py) must be used. Otherwise, it is recommended to
-       install the C(docker) Python module. Note that both modules should I(not)
-       be installed at the same time. Also note that when both modules are installed
-       and one of them is uninstalled, the other might no longer function and a
-       reinstall of it is required."
-    - "Docker API >= 1.21"
+  - "docker-py >= 1.10.0"
+  - "Docker API >= 1.21"
 '''
 
 EXAMPLES = '''
@@ -186,20 +178,16 @@ docker_disk_usage:
 
 '''
 
-from ansible.module_utils.docker_common import AnsibleDockerClient, DockerBaseClass
+from ansible.module_utils.docker.common import AnsibleDockerClient, DockerBaseClass
 from ansible.module_utils._text import to_native
 
 try:
-    from docker.errors import APIError, NotFound
+    from docker.errors import APIError
 except ImportError:
-    # missing docker-py handled in ansible.module_utils.docker_common
+    # missing docker-py handled in ansible.module_utils.docker.common
     pass
 
-try:
-    from ansible.module_utils.docker_common import docker_version, clean_dict_booleans_for_docker_api
-except Exception as dummy:
-    # missing docker-py handled in ansible.module_utils.docker
-    pass
+from ansible.module_utils.docker.common import clean_dict_booleans_for_docker_api
 
 
 class DockerHostManager(DockerBaseClass):