ceph-volume raw list will return the main disk instead of the mpath
setup. `ceph-volume lvm zap` on the main disks fails. This PR uses
`lsblk /mnt/<diskreference> ` to fetch the actual mapath disk and use it
for cleaning
Signed-off-by: Santosh Pillai <sapillai@redhat.com>
(cherry picked from commit 1e9da0766e)