[#574] morph: Add DeletionInfo method for morph client

Signed-off-by: Airat Arifullin <a.arifullin@yadro.com>

pkg/core/container/storage.go

@@ -20,6 +20,15 @@ type Container struct {
 	Session *session.Container
 }
 
+// DelInfo contains info about removed container.
+type DelInfo struct {
+	// Container owner.
+	Owner []byte
+
+	// Epoch indicates when the container was removed.
+	Epoch int
+}
+
 // Source is an interface that wraps
 // basic container receiving method.
 type Source interface {