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/module_utils/_api/transport/npipesocket.py

@@ -45,7 +45,7 @@ def check_closed(f):
     return wrapped
 
 
-class NpipeSocket(object):
+class NpipeSocket:
     """Partial implementation of the socket API over windows named pipes.
     This implementation is only designed to be used as a client socket,
     and server-specific methods (bind, listen, accept...) are not
@@ -227,7 +227,7 @@ class NpipeFileIOBase(io.RawIOBase):
         self.sock = npipe_socket
 
     def close(self):
-        super(NpipeFileIOBase, self).close()
+        super().close()
         self.sock = None
 
     def fileno(self):