builder/amazon: don't print windows password

builder/amazon/common/step_get_password.go

@@ -48,9 +48,7 @@ func (s *StepGetPassword) Run(state multistep.StateBag) multistep.StepAction {
 		ui.Say("Waiting for auto-generated password for instance...")
 		ui.Message(
 			"It is normal for this process to take up to 15 minutes,\n" +
-				"but it usually takes around 5. Please wait. After the\n" +
-				"password is read, it will printed out below. Since it should\n" +
-				"be a temporary password, this should be a minimal security risk.")
+				"but it usually takes around 5. Please wait.")
 		password, err = s.waitForPassword(state, cancel)
 		waitDone <- true
 	}()
@@ -68,7 +66,7 @@ WaitLoop:
 				return multistep.ActionHalt
 			}
 
-			ui.Message(fmt.Sprintf(" \nPassword retrieved: %s", password))
+			ui.Message(fmt.Sprintf(" \nPassword retrieved!"))
 			s.Comm.WinRMPassword = password
 			break WaitLoop
 		case <-timeout: