[releng] sigulsign_unsigned: Fix typo

[Till Maas]

commit a539be3f8f1769fb84156ca66ed4ffaa86f58f34
Author: Till Maas <opensource at till.name>
Date:   Sun Mar 8 22:39:03 2015 +0100

    sigulsign_unsigned: Fix typo

 scripts/sigulsign_unsigned.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/scripts/sigulsign_unsigned.py b/scripts/sigulsign_unsigned.py
index fd50319..0d88397 100755
--- a/scripts/sigulsign_unsigned.py
+++ b/scripts/sigulsign_unsigned.py
@@ -126,7 +126,7 @@ def get_key_info(source, filename=False):
 
         if import_result.imported != 1:
             raise ValueError(
-                "{0} does not contains exactly one GPG key".format(filename))
+                "{0} does not contain exactly one GPG key".format(filename))
 
         imported_fpr = import_result.imports[0][0]
         key = ctx.get_key(imported_fpr)