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review comments

rnaveiras/packer,mitchellh/packer,ricardclau/packer,grubernaut/packer,rnaveiras/packer,timsutton/packer,tas50/packer,bryson/packer,ricardclau/packer,dave2/packer,dave2/packer,dave2/packer,ricardclau/packer,paulmey/packer,grubernaut/packer,grubernaut/packer,paulmey/packer,ricardclau/packer,dave2/packer,hashicorp/packer,mitchellh/packer,hashicorp/packer,rnaveiras/packer,tas50/packer,pecigonzalo/packer,bryson/packer,bryson/packer,tas50/packer,timsutton/packer,bryson/packer,tas50/packer,pecigonzalo/packer,pecigonzalo/packer,dave2/packer,ricardclau/packer,mitchellh/packer,pecigonzalo/packer,timsutton/packer,timsutton/packer,rnaveiras/packer,hashicorp/packer,grubernaut/packer,mitchellh/packer,timsutton/packer,paulmey/packer,dave2/packer,tas50/packer,rnaveiras/packer,ricardclau/packer,timsutton/packer,hashicorp/packer,grubernaut/packer,grubernaut/packer,paulmey/packer,bryson/packer,mitchellh/packer,paulmey/packer,paulmey/packer,bryson/packer,tas50/packer,rnaveiras/packer