[PATCH stable-2.12] Fix string formatting

['Lisa Velden' via ganeti-devel]

Signed-off-by: Lisa Velden <vel...@google.com>
---
 lib/serializer.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/serializer.py b/lib/serializer.py
index c63577b..b4d5631 100644
--- a/lib/serializer.py
+++ b/lib/serializer.py
@@ -256,7 +256,7 @@ class Private(object):
     return "<%s>" % self._descr
 
   def __repr__(self):
-    return "Private(?, descr=%r)".format(self._descr)
+    return "Private(?, descr=%r)" % self._descr
 
   # pylint: disable=W0212
   # If it doesn't access _item directly, the call will go through __getattr__
-- 
2.2.0.rc0.207.ga3a616c