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.

.github/BOTMETA.yml

@@ -582,8 +582,7 @@ files:
     labels: windows
     maintainers: $team_windows_core
     support: core
-  $module_utils/docker_common.py: *docker
-  $module_utils/docker_swarm.py: *docker
+  $module_utils/docker/: *docker
   $module_utils/ec2.py:
     support: core
     labels:
@@ -1289,6 +1288,7 @@ files:
   test/integration/targets/postgresql: *postgresql
   test/integration/targets/setup_acme:
     maintainers: resmo felixfontein
+  test/integration/targets/setup_docker: *docker
   test/integration/targets/setup_mysql_db: *mysql
   test/integration/targets/setup_zabbix:
     maintainers: eikef D3DeFi
@@ -1304,8 +1304,13 @@ files:
   test/legacy/scaleway:
     <<: *scaleway
     support: community
+  test/units/module_utils/docker/:
+    <<: *docker
+    support: community
   test/units/module_utils/facts/network/test_generic_bsd.py: *bsd
-  test/units/modules/cloud/docker: *docker
+  test/units/modules/cloud/docker:
+    <<: *docker
+    support: community
   test/units/modules/network:
     maintainers: $team_networking
     labels: networking