keyring.util.properties have been deprecated (gh#jaraco/keyring#593).

Use jaraco.classes.properties instead (and yes, of course, the
upstream cannot keep API stable).

Fixes marcus-h#2

keyutils/backend.py

@@ -3,7 +3,7 @@
 import errno
 
 from keyring.backend import KeyringBackend
-from keyring.util import properties
+from jaraco.classes import properties
 from keyring.errors import PasswordDeleteError
 
 from keyutils.keys import session_keyring
@@ -20,7 +20,7 @@ def __init__(self, keyring_name='python-keyring-keyutils',
         self._key_type = key_type
         self._payload_encoding = payload_encoding
 
-    @properties.ClassProperty
+    @properties.classproperty
     @classmethod
     def priority(cls):
         return 1