Miscellaneous pylint fixes.

The following rules are no longer disabled:

- bad-format-string
- duplicate-key
- lost-exception
- trailing-newlines
- unexpected-keyword-arg
- useless-suppression
- using-constant-test

lib/ansible/config/data.py

@@ -42,4 +42,3 @@ class ConfigData(object):
             if plugin.name not in self._plugins[plugin.type]:
                 self._plugins[plugin.type][plugin.name] = {}
             self._plugins[plugin.type][plugin.name][setting.name] = setting
-