purge_cluster: wipe all partitions
purge_cluster: wipe all partitions

In order to ensure there is no leftover after having purged a cluster,
we must wipe all partitions properly.

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1492242

Signed-off-by: Guillaume Abrioux <30a9df5a0293a6108675377fa1673f7aa713f915@redhat.com>
(cherry picked from commit a9247c4de78dec8a63f17400deb8b06ce91e7267)

fgal/ceph-ansible,fgal/ceph-ansible