Set smoke/gate attributes for tests in "compute"

Change-Id: I3f6d496bd88b10f780b168caeb4b62d9138ae8e4
Implements: blueprint set-gate-attribute
diff --git a/tempest/api/compute/admin/test_services.py b/tempest/api/compute/admin/test_services.py
index aacfe8a..db7928a 100644
--- a/tempest/api/compute/admin/test_services.py
+++ b/tempest/api/compute/admin/test_services.py
@@ -34,14 +34,14 @@
         cls.client = cls.os_adm.services_client
         cls.non_admin_client = cls.services_client
 
-    @attr(type='positive')
+    @attr(type=['positive', 'gate'])
     def test_list_services(self):
         # List Compute services
         resp, services = self.client.list_services()
         self.assertEqual(200, resp.status)
         self.assertTrue(len(services) >= 2)
 
-    @attr(type='negative')
+    @attr(type=['negative', 'gate'])
     def test_list_services_with_non_admin_user(self):
         # List Compute service with non admin user
         self.assertRaises(exceptions.Unauthorized,