handover_fsm: send HANDOVER PERFORMED msg on internal ho

When an internal handover is done the specification demands to inform
the MSC about the event.

- Add sending of BSSMAP HANDOVER PERFORMED msg.

Change-Id: If26e5807280e0f75a423b3b04f8e3c698c82a351
Depends: libosmocore I825106858bd89afc9837811b8fed2e8accc82441
Related: OS#3645
diff --git a/tests/handover/handover_test.c b/tests/handover/handover_test.c
index f728c5b..6217ca3 100644
--- a/tests/handover/handover_test.c
+++ b/tests/handover/handover_test.c
@@ -219,6 +219,7 @@
 void create_conn(struct gsm_lchan *lchan)
 {
 	static struct bsc_msc_data fake_msc_data = {};
+	fake_msc_data.network = bsc_gsmnet;
 	static unsigned int next_imsi = 0;
 	char imsi[sizeof(lchan->conn->bsub->imsi)];
 	struct gsm_network *net = lchan->ts->trx->bts->network;