docker2podman: do not hardcode group name
docker2podman: do not hardcode group name

let's use `client_group_name` instead of hardcoding the name.

Signed-off-by: Guillaume Abrioux <30a9df5a0293a6108675377fa1673f7aa713f915@redhat.com>

ceph/ceph-ansible,ceph/ceph-ansible