move localexec to common/shell-local dir since it is related to shelling out locally

builder/amazon/common/ssm/session.go

@@ -14,7 +14,7 @@ import (
 	"github.com/aws/aws-sdk-go/service/ssm/ssmiface"
 	"github.com/hashicorp/packer/builder/amazon/common/awserrors"
 	"github.com/hashicorp/packer/common/retry"
-	"github.com/hashicorp/packer/helper/builder/localexec"
+	"github.com/hashicorp/packer/common/shell-local/localexec"
 	"github.com/hashicorp/packer/packer"
 )
 

builder/docker/exec.go

@@ -3,7 +3,7 @@ package docker
 import (
 	"os/exec"
 
-	"github.com/hashicorp/packer/helper/builder/localexec"
+	"github.com/hashicorp/packer/common/shell-local/localexec"
 	"github.com/hashicorp/packer/packer"
 )
 

common/shell-local/localexec/run_and_stream.go

@@ -14,6 +14,10 @@ import (
 	"github.com/hashicorp/packer/packer"
 )
 
+// RunAndStream allows you to run a local command and stream output to the UI.
+// This does not require use of a shell-local communicator, so is a nice tool
+// for plugins that need to shell out to a local dependency and provide clear
+// output to users.
 func RunAndStream(cmd *exec.Cmd, ui packer.Ui, sensitive []string) error {
 	stdout_r, stdout_w := io.Pipe()
 	stderr_r, stderr_w := io.Pipe()

common/step_create_cdrom.go

@@ -11,7 +11,7 @@ import (
 	"runtime"
 	"strings"
 
-	"github.com/hashicorp/packer/helper/builder/localexec"
+	"github.com/hashicorp/packer/common/shell-local/localexec"
 	"github.com/hashicorp/packer/helper/multistep"
 	"github.com/hashicorp/packer/packer"
 	"github.com/hashicorp/packer/packer/tmp"