only log when external plugin is used, since this is the much rarer event
only log when external plugin is used, since this is the much rarer event

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