common: remove unused test function getDirectory()
common: remove unused test function getDirectory()

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