Skip test_created_server_uefi when barbican integration enabled

Skip because test creates image which should be signed.

Related-Prod: PRODX-29452
Change-Id: I2131347a993f4551bdfc66a4a717e746ee4c692f
(cherry picked from commit f776716a2e3b78bd0b7be495c003aac92f59185d)
diff --git a/tempest/api/compute/admin/test_create_server.py b/tempest/api/compute/admin/test_create_server.py
index 5bc9206..3cc2928 100644
--- a/tempest/api/compute/admin/test_create_server.py
+++ b/tempest/api/compute/admin/test_create_server.py
@@ -151,6 +151,9 @@
         super(ServersTestUEFI, cls).setup_clients()
         cls.client = cls.servers_client
 
+    @testtools.skipIf(
+        CONF.compute_feature_enabled.barbican_integration_enabled,
+        "Not supported when barbican integration enabled.")
     @decorators.idempotent_id('94feb6c3-d07e-b3b9-def8-64fd082d9b21')
     def test_created_server_uefi(self):
         # create custom image with uefi type