Python code modernization, 3/n (#1157)

* Remove __metaclass__ = type.

for i in $(grep -REl '__metaclass__ = type' plugins/ tests/); do
  sed -e '/^__metaclass__ = type/d' -i $i;
done

* Remove super arguments, and stop inheriting from object.

plugins/plugin_utils/_common.py

@@ -7,10 +7,6 @@
 
 from __future__ import annotations
 
-
-__metaclass__ = type
-
-
 from ansible.errors import AnsibleConnectionFailure
 from ansible.utils.display import Display
 from ansible_collections.community.docker.plugins.module_utils._common import (
@@ -25,7 +21,7 @@ class AnsibleDockerClient(AnsibleDockerClientBase):
     def __init__(self, plugin, min_docker_version=None, min_docker_api_version=None):
         self.plugin = plugin
         self.display = Display()
-        super(AnsibleDockerClient, self).__init__(
+        super().__init__(
             min_docker_version=min_docker_version,
             min_docker_api_version=min_docker_api_version,
         )

plugins/plugin_utils/_common_api.py

@@ -21,9 +21,7 @@ class AnsibleDockerClient(AnsibleDockerClientBase):
     def __init__(self, plugin, min_docker_api_version=None):
         self.plugin = plugin
         self.display = Display()
-        super(AnsibleDockerClient, self).__init__(
-            min_docker_api_version=min_docker_api_version
-        )
+        super().__init__(min_docker_api_version=min_docker_api_version)
 
     def fail(self, msg, **kwargs):
         if kwargs:

plugins/plugin_utils/_socket_handler.py

@@ -7,10 +7,6 @@
 
 from __future__ import annotations
 
-
-__metaclass__ = type
-
-
 import selectors
 
 from ansible_collections.community.docker.plugins.module_utils._socket_handler import (
@@ -20,6 +16,6 @@ from ansible_collections.community.docker.plugins.module_utils._socket_handler i
 
 class DockerSocketHandler(DockerSocketHandlerBase):
     def __init__(self, display, sock, log=None, container=None):
-        super(DockerSocketHandler, self).__init__(
+        super().__init__(
             sock, selectors, log=lambda msg: display.vvvv(msg, host=container)
         )