Add oom support to events

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

supervisor/oom.go

@@ -0,0 +1,22 @@
+package supervisor
+
+import (
+	"time"
+
+	"github.com/Sirupsen/logrus"
+)
+
+type OOMTask struct {
+	baseTask
+	ID string
+}
+
+func (s *Supervisor) oom(t *OOMTask) error {
+	logrus.WithField("id", t.ID).Debug("containerd: container oom")
+	s.notifySubscribers(Event{
+		Timestamp: time.Now(),
+		ID:        t.ID,
+		Type:      "oom",
+	})
+	return nil
+}