Make __hash__ None for class Message

Author: ttanay

apitools/base/protorpclite/messages.py

@@ -758,6 +758,8 @@ class Order(Message):
 
     """
 
+    __hash__ = None
+
     def __init__(self, **kwargs):
         """Initialize internal messages state.
 
@@ -1058,10 +1060,6 @@ def __ne__(self, other):
         """
         return not self.__eq__(other)
 
-    def __hash__(self):
-        """Hash by __tags"""
-        return hash(self.__tags)
-
 
 class FieldList(list):
     """List implementation that validates field values.