If the disk being zapped is used by lvm (if it contains the
lvm label and hasn't been pvremove'd) it's safer to simply
bail out of zapping it than attempt teardown through a force
pvremove, because the disk being zapped might be in fact in
use by some LV.
Closes-Bug: 1858519
Change-Id: I111475c5a4584a3e367c604ab51ce2ef3789ff7f