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/_logfmt.py

@@ -22,7 +22,7 @@ class InvalidLogFmt(Exception):
     pass
 
 
-class _Mode(object):
+class _Mode:
     GARBAGE = 0
     KEY = 1
     EQUAL = 2
@@ -72,7 +72,7 @@ def _is_ident(cur):
     return cur > " " and cur not in ('"', "=")
 
 
-class _Parser(object):
+class _Parser:
     def __init__(self, line):
         self.line = line
         self.index = 0