Add a restart event, and make one during restart policy

Signed-off-by: Matthew Heon <matthew.heon@pm.me>

docs/podman-events.1.md

@@ -28,6 +28,7 @@ The *container* event type will report the follow statuses:
  * pause
  * prune
  * remove
+ * restart
  * restore
  * start
  * stop

libpod/container_internal.go

@@ -229,6 +229,8 @@ func (c *Container) handleRestartPolicy(ctx context.Context) (err error) {
 		return errors.Wrapf(ErrInternal, "invalid container state encountered in restart attempt!")
 	}
 
+	c.newContainerEvent(events.Restart)
+
 	// Increment restart count
 	c.state.RestartCount = c.state.RestartCount + 1
 	logrus.Debugf("Container %s now on retry %d", c.ID(), c.state.RestartCount)
@@ -1060,6 +1062,8 @@ func (c *Container) restartWithTimeout(ctx context.Context, timeout uint) (err e
 		return errors.Wrapf(ErrCtrStateInvalid, "unable to restart a container in a paused or unknown state")
 	}
 
+	c.newContainerEvent(events.Restart)
+
 	if c.state.State == ContainerStateRunning {
 		if err := c.stop(timeout); err != nil {
 			return err

libpod/events/config.go

@@ -134,6 +134,8 @@ const (
 	// Renumber indicates that lock numbers were reallocated at user
 	// request.
 	Renumber Status = "renumber"
+	// Restart indicates the target was restarted via an API call.
+	Restart Status = "restart"
 	// Restore ...
 	Restore Status = "restore"
 	// Save ...