zap_device: ability to zap partitions only
zap_device: ability to zap partitions only

Although the previous implementation was harmless, it failed to only
remove a single partition from a device. Now you can pass -e
OSD_DEVICE=/dev/sda1, as well as an nvme partition such as
/dev/nvme0n1p2.

Closes: https://github.com/ceph/ceph-container/pull/1119
Signed-off-by: Sébastien Han <62d754cc350e84d3b1c32ae79f976f5348e74a40@redhat.com>

ceph/ceph-docker,ceph/ceph-docker