packaging: setup: raising on wrong disk size if not interactive
packaging: setup: raising on wrong disk size if not interactive

Raising on wrong disk size if not interactive. Without this
it loops forever trying to validate an invalid value.

Change-Id: I37b324bd4839ff8011999903cba7928b635af7a2
Bug-Url: https://bugzilla.redhat.com/1254104
Signed-off-by: Simone Tiraboschi <cb03129c66ba4da7ba7044049d0f43907bf857bb@redhat.com>

oVirt/ovirt-hosted-engine-setup,oVirt/ovirt-hosted-engine-setup