Add tag smoke for test_server_signal_userdata_format_raw

Related-prod: PRODX-20134
Change-Id: Iececd7cc4975885a37ece811db8d556ac801b4da
diff --git a/heat_tempest_plugin/tests/scenario/test_server_signal.py b/heat_tempest_plugin/tests/scenario/test_server_signal.py
index 167dfa0..ab31d01 100644
--- a/heat_tempest_plugin/tests/scenario/test_server_signal.py
+++ b/heat_tempest_plugin/tests/scenario/test_server_signal.py
@@ -80,6 +80,7 @@
                 "Timed out waiting for %s to become reachable" % server_ip)
 
     @decorators.idempotent_id('8da0f6cc-60e6-4298-9e54-e1f905c5552a')
+    @decorators.attr(type='smoke')
     def test_server_signal_userdata_format_raw(self):
         self._test_server_signal(image=self.conf.minimal_image_ref,
                                  flavor=self.conf.minimal_instance_type)