Pend grub/menu.lst serverspec

  * AWS and OpenStack clobber this symlink

Signed-off-by: Jeffrey Peckham <peckham@pivotallabs.com>
Make specs testing :verbose more explicit/flexible

Signed-off-by: Jeffrey Peckham <peckham@pivotallabs.com>
DiskImage retries once if device is not available

Signed-off-by: Jeffrey Peckham <peckham@pivotallabs.com>
Move disk_image_name to prelude_apply.bash

  * make unmount/unmap more resiliant to failure in image_aws_update_grub

Signed-off-by: Jeffrey Peckham <peckham@pivotallabs.com>