Remove container on load if it exited

If the shim gets sigkilled while containerd is down we need to be able
to remove the container correctly so that it does not stay in a stopped
state forever.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

supervisor/supervisor.go

@@ -272,12 +272,12 @@ func (s *Supervisor) restore() error {
 		logrus.WithField("id", id).Debug("containerd: container restored")
 		var exitedProcesses []runtime.Process
 		for _, p := range processes {
-			if _, err := p.ExitStatus(); err == nil {
-				exitedProcesses = append(exitedProcesses, p)
-			} else {
+			if p.State() == runtime.Running {
 				if err := s.monitorProcess(p); err != nil {
 					return err
 				}
+			} else {
+				exitedProcesses = append(exitedProcesses, p)
 			}
 		}
 		if len(exitedProcesses) > 0 {