Add smoke tag to compute version tests

Version API is important to know what versions are supported on clouds
and the API operation is light-weight.
It is nice to make these tests smoke like Neutron API tests.

Change-Id: I4bd13b969cdb96e528c8c8d37bc9dbe1f8f8e476

tempest/api/compute/test_versions.py

@@ -14,11 +14,13 @@
 
 from tempest.api.compute import base
 from tempest.lib import decorators
+from tempest import test
 
 
 class TestVersions(base.BaseV2ComputeTest):
 
     @decorators.idempotent_id('6c0a0990-43b6-4529-9b61-5fd8daf7c55c')
+    @test.attr(type='smoke')
     def test_list_api_versions(self):
         """Test that a get of the unversioned url returns the choices doc.
 
@@ -37,6 +39,7 @@ class TestVersions(base.BaseV2ComputeTest):
                          "The first listed version should be v2.0")
 
     @decorators.idempotent_id('b953a29e-929c-4a8e-81be-ec3a7e03cb76')
+    @test.attr(type='smoke')
     def test_get_version_details(self):
         """Test individual version endpoints info works.