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/modules/docker_swarm.py

@@ -315,7 +315,7 @@ from ansible_collections.community.docker.plugins.module_utils._util import (
 
 class TaskParameters(DockerBaseClass):
     def __init__(self):
-        super(TaskParameters, self).__init__()
+        super().__init__()
 
         self.advertise_addr = None
         self.listen_addr = None
@@ -461,7 +461,7 @@ class SwarmManager(DockerBaseClass):
 
     def __init__(self, client, results):
 
-        super(SwarmManager, self).__init__()
+        super().__init__()
 
         self.client = client
         self.results = results