Add revoke-sudo role and update tox jobs

Change-Id: Ie0df08b6c4e4442e6d769b6ca26e59f919889566
Signed-off-by: Paul Belanger <pabelanger@redhat.com>
diff --git a/playbooks/tox-py27.yaml b/playbooks/tox-py27.yaml
index 64721e9..fd45f27 100644
--- a/playbooks/tox-py27.yaml
+++ b/playbooks/tox-py27.yaml
@@ -3,4 +3,5 @@
     run_tox_envlist: py27
   roles:
     - extra-test-setup
+    - revoke-sudo
     - run-tox