Fix the pre stop hook for disks-images-provider
Fix the pre stop hook for disks-images-provider

The manual creation of local block storage has been removed from
images/disks-images-provider/entrypoint.sh along with the LOOP_DEVICE
env var in 23fae807d7. So drop the leftover cleanup code of the loop
device as it causes failures of the pre stop hook.

Signed-off-by: Vasiliy Ulyanov <874333a19fcb57a423921069a9d8e451d537235a@suse.de>

kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt