issue2551116 - difusedxml support - python2 fixups.

Make sure python2 code path sets client.defusedxml so the code can
still run.

Bomb tests fail under python2. So disable test under python 2. In the
past it was due to string/byte type difference. Not worth fixing the
tests since python 2 support dropped.

roundup/anypy/xmlrpc_.py

@@ -3,18 +3,19 @@
     from xmlrpc import client, server
     # If client.defusedxml == False, client.py will warn that
     # xmlrpc is insecure and defusedxml should be installed.
-    client.defusedxml=False
+    client.defusedxml = False
     try:
         from defusedxml import xmlrpc
         xmlrpc.monkey_patch()
         # figure out how to allow user to set xmlrpc.MAX_DATA = bytes
-        client.defusedxml=True
+        client.defusedxml = True
     except ImportError:
         # use regular xmlrpc with warnings
         pass
 
-    server.SimpleXMLRPCDispatcher
+    server.SimpleXMLRPCDispatcher  # noqa: B018
 except (ImportError, AttributeError):
     # Python 2.
     import SimpleXMLRPCServer as server
     import xmlrpclib as client  # noqa: F401
+    client.defusedxml = False

test/test_xmlrpc.py

@@ -35,6 +35,13 @@
 
     skip_defusedxml_used = lambda func, *args, **kwargs: func
 
+if sys.version_info[0] > 2:
+    skip_python2 = lambda func, *args, **kwargs: func
+else:
+    skip_python2 = mark_class(pytest.mark.skip(
+        reason='Skipping test under python 2'))
+
+
 class XmlrpcTest(object):
 
     backend = None
@@ -327,10 +334,12 @@ class S:
         for n, r in enumerate(result):
             self.assertEqual(r, results[n])
 
+    @skip_python2
     @skip_defusedxml
     def testDefusedXmlBomb(self):
         self.XmlBomb(expectIn=b"defusedxml.common.EntitiesForbidden")
 
+    @skip_python2
     @skip_defusedxml_used
     def testNonDefusedXmlBomb(self):
         self.XmlBomb(expectIn=b"1234567890"*511)