tests: followup on #2656
tests: followup on #2656

34f70428 has introduced a fix using `command` module while this could
have been achieved by using `lvol` module.

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

font/ceph-ansible,ceph/ceph-ansible,fgal/ceph-ansible,ceph/ceph-ansible,fgal/ceph-ansible,font/ceph-ansible