Upgrade to Packer 1.5

The `Provisioner` interface has changed to accommodate a migration of
Packer configs to HCL2. We've run the Hashicorp-provided code generator and
checked in the resulting code, and updated the interface.

bolt/provisioner.go

@@ -1,3 +1,4 @@
+//go:generate mapstructure-to-hcl2 -type Config
 package bolt
 
 import (
@@ -24,6 +25,7 @@ import (
 	"sync"
 	"unicode"
 
+	"github.com/hashicorp/hcl/v2/hcldec"
 	"github.com/hashicorp/packer/common"
 	"github.com/hashicorp/packer/common/adapter"
 	commonhelper "github.com/hashicorp/packer/helper/common"
@@ -85,6 +87,10 @@ type PassthroughTemplate struct {
 	WinRMPassword string
 }
 
+func (p *Provisioner) ConfigSpec() hcldec.ObjectSpec {
+	return p.config.FlatMapstructure().HCL2Spec()
+}
+
 // Prepare the config data for provisioning
 func (p *Provisioner) Prepare(raws ...interface{}) error {
 	p.done = make(chan struct{})
@@ -185,7 +191,7 @@ func (p *Provisioner) getVersion() error {
 }
 
 // Provision using the Puppet Bolt provisioner
-func (p *Provisioner) Provision(ctx context.Context, ui packer.Ui, comm packer.Communicator) error {
+func (p *Provisioner) Provision(ctx context.Context, ui packer.Ui, comm packer.Communicator, generatedData map[string]interface{}) error {
 	ui.Say("Provisioning with Puppet Bolt...")
 
 	k, err := newUserKey(p.config.SSHAuthorizedKeyFile)