Wipe each partition for all disks when removing nodes

If partitions are not wiped then old formatted filesystems
will show up if a parititon is created at the same point as
the previous one. This will cause ceph-deploy to fail when
bringing up an OSD. Ceph will see an XFS filesystem and the
correct partition GUID and auto-mount the partition prior to
activating the OSD.

Change-Id: I2b71ec429ac1982f3df585423ca0818b294d8210
Closes-bug: #1323343