builder/vmware: more flexible ISO removing
builder/vmware: more flexible ISO removing

/cc @timsutton - This is a bit more flexible.

suma/packer,patricklucas/packer,patricklucas/packer,zyegfryed/packer,zyegfryed/packer,suma/packer,suma/packer,patricklucas/packer,TranscendComputing/packer,Kaixiang/packer,zyegfryed/packer,zyegfryed/packer,TranscendComputing/packer,suma/packer,TranscendComputing/packer,TranscendComputing/packer,Kaixiang/packer,Kaixiang/packer,Kaixiang/packer,patricklucas/packer