Fix failing test.

Author: geerlingguy

.travis.yml

@@ -35,7 +35,7 @@ script:
   - 'docker exec --tty "$(cat ${container_id})" env TERM=xterm ansible-playbook /etc/ansible/roles/role_under_test/tests/${playbook} --syntax-check'
 
   # Test role.
-  - 'docker exec --tty "$(cat ${container_id})" env TERM=xterm ansible-playbook /etc/ansible/roles/role_under_test/tests/${playbook}'
+  - 'docker exec "$(cat ${container_id})" ansible-playbook /etc/ansible/roles/role_under_test/tests/${playbook}'
 
   # Test role idempotence.
   - idempotence=$(mktemp)