Remove one heat test from smoke

One of the heat tempest test marked as smoke use
a lot of resources, so that we desided to remobe
it from the smoke.

Change-Id: I21b03a9f9d9f17e28adad4fb66ba7a3a0d7efb4e
diff --git a/heat_tempest_plugin/tests/scenario/test_server_signal.py b/heat_tempest_plugin/tests/scenario/test_server_signal.py
index 8beb6a4..8fc6758 100644
--- a/heat_tempest_plugin/tests/scenario/test_server_signal.py
+++ b/heat_tempest_plugin/tests/scenario/test_server_signal.py
@@ -84,7 +84,6 @@
         self._test_server_signal(image=self.conf.minimal_image_ref,
                                  flavor=self.conf.minimal_instance_type)
 
-    @decorators.attr(type='smoke')
     @decorators.idempotent_id('3d753d42-7c16-4a0e-8f73-875881826626')
     def test_server_signal_userdata_format_software_config(self):
         if not self.conf.image_ref: