title: pylint: disabling R0921 does not work, still warning
body: <p>I have a class which has two methods that raise <code>NotImplementedError</code> and also inherits from an abstract class (a class that contains abstract methods, from the <code>abc</code> package. This parent class in turn inherits from a class marked as abstract through <code>__metaclass__ = ABCMeta</code>). Due to this a R0921 warning is raised when running pylint on my code. If I remove the <code>NotImplementedErrors</code> pylint does not give that warning. Now, I've tried disabling the R0921 for the class like this:</p>
  
  <pre><code># pylint: disable=R0921
  class Wrapper(AbstractWrapper):
      ...
      def func(self, kwargs**):
          raise NotImplementedError
      ...
  </code></pre>
  
  <p>But it does not seem to work. I still get the warning "Abstract class not referenced". What am I missing?</p>