Fix attributes sorting based on source code

In Python 3.3, when looking for the source code of line with inspect,
sometimes it returnes the class AType that is defined line 155 of
test_types.py, which breaks the test.
Renaming this AType class to ABCDType, which is a unique name, fix the
problem.

Change-Id: I54e4a3b5a2df1158dfed0832fe7ab3a9e577ab72

wsme/tests/test_types.py

@@ -220,15 +220,14 @@ class TestTypes(unittest.TestCase):
         assert isinstance(obj.abytes, types.bytes)
 
     def test_named_attribute(self):
-        class AType(object):
+        class ABCDType(object):
             a_list = types.wsattr([int], name='a.list')
             astr = str
 
-        types.register_type(AType)
+        types.register_type(ABCDType)
 
-        assert len(AType._wsme_attributes) == 2
-        attrs = AType._wsme_attributes
-        print(attrs)
+        assert len(ABCDType._wsme_attributes) == 2
+        attrs = ABCDType._wsme_attributes
 
         assert attrs[0].key == 'a_list', attrs[0].key
         assert attrs[0].name == 'a.list', attrs[0].name