[1.7.x] Skipped a test that errors rather than marked it as an expectedFailure.

The test throws an error which Python 3.4 doesn't seem to catch as an
expectedFailure.

refs 7476d96f83

Backport of c170c3761b from master

tests/serializers_regress/tests.py

@@ -10,7 +10,7 @@ from __future__ import unicode_literals
 
 import datetime
 import decimal
-from unittest import expectedFailure, skipUnless
+from unittest import skip, skipUnless
 import warnings
 
 try:
@@ -482,8 +482,7 @@ def serializerTest(format, self):
         self.assertEqual(count, klass.objects.count())
 
 if connection.vendor == 'mysql' and six.PY3:
-    # Existing MySQL DB-API drivers fail on binary data.
-    serializerTest = expectedFailure(serializerTest)
+    serializerTest = skip("Existing MySQL DB-API drivers fail on binary data.")(serializerTest)
 
 
 def naturalKeySerializerTest(format, self):