Add pylint hints to AbstractType because we cant mark a classmethod as abstract

kafka/protocol/abstract.py

@@ -5,11 +5,11 @@ class AbstractType(object):
     __metaclass__ = abc.ABCMeta
 
     @abc.abstractmethod
-    def encode(cls, value):
+    def encode(cls, value): # pylint: disable=no-self-argument
         pass
 
     @abc.abstractmethod
-    def decode(cls, data):
+    def decode(cls, data): # pylint: disable=no-self-argument
         pass
 
     @classmethod