as stated in https://github.com/ansible/ansible/issues/4297
if we register a variable twice and even if a task is skipped the
register will not get overwritten... So we use the fact variant as
mentionned in the ansible issue.
Signed-off-by: Sébastien Han <seb@redhat.com>
This will likely one day or another break something. If ceph-disk
complains about a disk just use the purge-cluster.yml playbook first as
it will wipe all the devices.
Signed-off-by: Sébastien Han <seb@redhat.com>