Change all non-slow scenario tests to smoke

Smoke test should be able to check the integrity of the OpenStack cloud
environment easily. And the scenario tests should cover the popular use
cases.
So I think scenario tests should also be executed as smoke tests.
This commit changes all non-slow scenario tests to smoke.

Change-Id: Ia08c7dcec20501a5086e2078439076eeac234cff
Merge "Change all non-slow scenario tests to smoke"