Use crash-loop.ps1 to restart rancher-agent windows service

Add a crash-loop.ps1 to bring up the crashed service. So in
rancher agent, it needs to set it failure action to run the
crash-loop.ps1

register/service_windows.go

@@ -7,16 +7,17 @@ import (
 
 	"bytes"
 	"fmt"
+	"os/exec"
+	"path/filepath"
+	"syscall"
+
 	"github.com/Sirupsen/logrus"
 	"github.com/pkg/errors"
 	"golang.org/x/sys/windows"
 	"golang.org/x/sys/windows/svc"
 	"golang.org/x/sys/windows/svc/debug"
 	"golang.org/x/sys/windows/svc/eventlog"
 	"golang.org/x/sys/windows/svc/mgr"
-	"os/exec"
-	"path/filepath"
-	"syscall"
 )
 
 // credits for https://github.com/docker/docker/blob/5c1826ec4de381df9f739ce0de28e37d4f734d47/cmd/dockerd/service_windows.go
@@ -26,6 +27,7 @@ const (
 	logFile          = "C:/ProgramData/rancher/agent.log"
 	rancherPanicFile = "C:/ProgramData/rancher/panic.log"
 	homeDir          = "C:/ProgramData/rancher"
+	restartCommand   = `"powershell.exe" -File "c:\program files\rancher\crash-loop.ps1" agent`
 	// These should match the values in event_messages.mc.
 	eventInfo  = 1
 	eventWarn  = 1
@@ -196,11 +198,17 @@ func registerService(url string) error {
 		Delay uint32
 	}
 	t := []scAction{
-		{Type: scActionRestart, Delay: uint32(60 * time.Second / time.Millisecond)},
-		{Type: scActionRestart, Delay: uint32(60 * time.Second / time.Millisecond)},
-		{Type: scActionNone},
+		{Type: scActionRunCommand, Delay: uint32(15 * time.Second / time.Millisecond)},
+		{Type: scActionRunCommand, Delay: uint32(15 * time.Second / time.Millisecond)},
+		{Type: scActionRunCommand, Delay: uint32(15 * time.Second / time.Millisecond)},
+	}
+	cmd, _ := syscall.UTF16PtrFromString(restartCommand)
+	lpInfo := serviceFailureActions{
+		ResetPeriod:  uint32(24 * time.Hour / time.Second),
+		ActionsCount: uint32(3),
+		Actions:      uintptr(unsafe.Pointer(&t[0])),
+		Command:      cmd,
 	}
-	lpInfo := serviceFailureActions{ResetPeriod: uint32(24 * time.Hour / time.Second), ActionsCount: uint32(3), Actions: uintptr(unsafe.Pointer(&t[0]))}
 	err = windows.ChangeServiceConfig2(s.Handle, serviceConfigFailureActions, (*byte)(unsafe.Pointer(&lpInfo)))
 	if err != nil {
 		return err