Fix import broken by bad merge

supervisor/tests/test_options.py

@@ -662,7 +662,7 @@ class ServerOptionsTests(unittest.TestCase):
         with open(supervisord_conf, 'w') as f:
             f.write(text)
 
-        from supervisor.compat import letters
+        from string import letters
         a_z = letters[:26]
         for letter in reversed(a_z):
             filename = os.path.join(conf_d, "%s.conf" % letter)