Cleaned up golint warnings
Cleaned up golint warnings

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