When an ebs volume fails to delete, Packer reports that there
was an error deleting the volume and the volume id. But it doesn't
give you the details of what that error is. This commit adds the
error reported back to the standard output.
This removes the unnecessary check for AMIs before cleaning up volumes.
AMIs will exist on a successful run, but not when a build fails after
instance creation (during provisioning for example). The following
check for instance being nil should be sufficient.
Matthew Hooker
Richard Moore
Jeremy Asher
Chris Bednarski
Clint Shryock