fix checking subnet type
fix checking subnet type

mitchellh/packer,rnaveiras/packer,mitchellh/packer,hashicorp/packer,pecigonzalo/packer,hashicorp/packer,mitchellh/packer,pecigonzalo/packer,rnaveiras/packer,pecigonzalo/packer,hashicorp/packer,rnaveiras/packer,pecigonzalo/packer,hashicorp/packer,rnaveiras/packer,rnaveiras/packer,mitchellh/packer,rnaveiras/packer,mitchellh/packer