not all scenario tests should be in smoke

The decision to include all of scenario by default makes for an
extremely heavy test of tests in smoke, we should instead only include
specific scenario tests that expose some basic sanity
checking. Advanced scenario tests should be dropped from this list.

This change means we no longer have to exclude 'slow' tests, as we'll
just tag the right tests with smoke.

Change-Id: I34aa8aa9274e02bb68f62863d64c47ba9916f2e4
diff --git a/tempest/scenario/test_volume_boot_pattern.py b/tempest/scenario/test_volume_boot_pattern.py
index 5bc24ea..8a9522a 100644
--- a/tempest/scenario/test_volume_boot_pattern.py
+++ b/tempest/scenario/test_volume_boot_pattern.py
@@ -134,6 +134,7 @@
         self.assertEqual(expected, actual)
 
     @test.idempotent_id('557cd2c2-4eb8-4dce-98be-f86765ff311b')
+    @test.attr(type='smoke')
     @test.services('compute', 'volume', 'image')
     def test_volume_boot_pattern(self):
         keypair = self.create_keypair()