Removes ISO image if found corrupt
Removes ISO image if found corrupt

This patch automatically removes the corrupt
ISO image if md5sum doesn't match and prompts
user to re-run osbash script as oppose to asking
the user to remove the corrupt image.

Change-Id: I0dae5d7b88980a5644ec684f8cc8f04697f06e8b

openstack/training-labs,dguitarbite/OpenStack-Labs,openstack/training-labs,dguitarbite/OpenStack-Labs,dguitarbite/OpenStack-Labs,openstack/training-labs