tests: fix container-cephadm job

add missing variable `containerized_deployment` in group_vars

Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>
(cherry picked from commit 66f3eb3)

tests/functional/cephadm/group_vars/all

@@ -6,3 +6,4 @@ dashboard_admin_password: $sX!cD$rYU6qR^B!
 ceph_docker_registry: quay.ceph.io
 ceph_docker_image: ceph-ci/daemon-base
 ceph_docker_image_tag: latest-octopus
+containerized_deployment: true