Skip blank role name test until resolved upsteam

Fixes bug #997685

Change-Id: I2ba13b9a002692fa5658ca0cc7043bc954524908
diff --git a/tempest/tests/identity/test_roles.py b/tempest/tests/identity/test_roles.py
index 9f51505..1d413d7 100644
--- a/tempest/tests/identity/test_roles.py
+++ b/tempest/tests/identity/test_roles.py
@@ -56,6 +56,7 @@
         found = [role for role in body if role['name'] == role_name]
         self.assertFalse(any(found))
 
+    @unittest.skip('Until bug 997725 is fixed.')
     def test_role_create_blank_name(self):
         """Should not be able to create a role with a blank name"""
         try: