another bug introduced by PR 815

Author: jettero

hubblestack/utils/signing.py

@@ -142,7 +142,7 @@ def __getattribute__(self, name):
             pass
         try:
             default = getattr(self.Defaults, name)
-            return __salt__['config.get']('repo_signing:%s'.format(name), default)
+            return __salt__['config.get']('repo_signing:{}'.format(name), default)
         except AttributeError:
             raise