Add revoke-sudo role and update tox jobs

Change-Id: Ie0df08b6c4e4442e6d769b6ca26e59f919889566
Signed-off-by: Paul Belanger <pabelanger@redhat.com>
diff --git a/playbooks/roles/revoke-sudo/tasks/main.yaml b/playbooks/roles/revoke-sudo/tasks/main.yaml
new file mode 100644
index 0000000..1c18187
--- /dev/null
+++ b/playbooks/roles/revoke-sudo/tasks/main.yaml
@@ -0,0 +1,8 @@
+- name: Remove sudo access for zuul user.
+  become: yes
+  file:
+    path: /etc/sudoers.d/zuul-sudo
+    state: absent
+
+- name: Prove that general sudo access is actually revoked.
+  shell: ! sudo -n true