[SEBA-873] add reboot olt support

Change-Id: I1570d05313661a6d66e1596b9f9a1a1cc17d1a73
diff --git a/internal/bbsim/devices/onu_test_helpers.go b/internal/bbsim/devices/onu_test_helpers.go
index 2f9926f..8e071c1 100644
--- a/internal/bbsim/devices/onu_test_helpers.go
+++ b/internal/bbsim/devices/onu_test_helpers.go
@@ -129,5 +129,7 @@
 		ID: 1,
 	}
 	onu := CreateONU(olt, pon, 1, 900, 900, false, false)
+	// NOTE we need this in order to create the OnuChannel
+	onu.InternalState.Event("initialize")
 	return onu
 }