update to 1.5.4 dev on master branch
update to 1.5.4 dev on master branch

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