One shot teardown.

Unique or none lvm command issued instead of recursive image
volumes produces.

Changing volumes that are active in multiple hosts can lead to DC.

Related to BZ#960952, BZ#769502.

Change-Id: I4b6a4e99cf3a657affb4f5e96aa1ac1978a297da
Signed-off-by: Eduardo <ewarszaw@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/4234
Tested-by: Elad Ben Aharon <eladba1990@gmail.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>