builder/hyper-v don't wait for shutdown to return.

Mirrors work done in #4436

builder/hyperv/common/step_shutdown.go

@@ -4,10 +4,11 @@ import (
 	"bytes"
 	"errors"
 	"fmt"
-	"github.com/mitchellh/multistep"
-	"github.com/mitchellh/packer/packer"
 	"log"
 	"time"
+
+	"github.com/mitchellh/multistep"
+	"github.com/mitchellh/packer/packer"
 )
 
 // This step shuts down the machine. It first attempts to do so gracefully,
@@ -51,14 +52,6 @@ func (s *StepShutdown) Run(state multistep.StateBag) multistep.StepAction {
 			return multistep.ActionHalt
 		}
 
-		// Wait for the command to run so we can print std{err,out}
-		// We don't care if the command errored, since we'll notice
-		// if the vm didn't shut down.
-		cmd.Wait()
-
-		log.Printf("Shutdown stdout: %s", stdout.String())
-		log.Printf("Shutdown stderr: %s", stderr.String())
-
 		// Wait for the machine to actually shut down
 		log.Printf("Waiting max %s for shutdown to complete", s.Timeout)
 		shutdownTimer := time.After(s.Timeout)
@@ -70,12 +63,14 @@ func (s *StepShutdown) Run(state multistep.StateBag) multistep.StepAction {
 
 			select {
 			case <-shutdownTimer:
+				log.Printf("Shutdown stdout: %s", stdout.String())
+				log.Printf("Shutdown stderr: %s", stderr.String())
 				err := errors.New("Timeout while waiting for machine to shut down.")
 				state.Put("error", err)
 				ui.Error(err.Error())
 				return multistep.ActionHalt
 			default:
-				time.Sleep(150 * time.Millisecond)
+				time.Sleep(500 * time.Millisecond)
 			}
 		}
 	} else {