helper/builder/testing: prune unused functions (#8852)
helper/builder/testing: prune unused functions (#8852)


ricardclau/packer,rnaveiras/packer,ricardclau/packer,grubernaut/packer,grubernaut/packer,ricardclau/packer,mitchellh/packer,mitchellh/packer,rnaveiras/packer,mitchellh/packer,grubernaut/packer,hashicorp/packer,pecigonzalo/packer,hashicorp/packer,mitchellh/packer,pecigonzalo/packer,ricardclau/packer,paulmey/packer,ricardclau/packer,pecigonzalo/packer,ricardclau/packer,grubernaut/packer,paulmey/packer,paulmey/packer,mitchellh/packer,rnaveiras/packer,paulmey/packer,rnaveiras/packer,grubernaut/packer,grubernaut/packer,hashicorp/packer,pecigonzalo/packer,paulmey/packer,hashicorp/packer,paulmey/packer,rnaveiras/packer,rnaveiras/packer