BSC_Tests: expect a HANDOVER PERFORMED message on internal handover

When an internal handover is performed, the BSC is expected to inform
the MSC about the event by sending a BSSMAP HANDOVER PERFORMED message.
This feature was missing in the BSC and has now been added. The tests
need to be upgraded in order to handle the additional message.

- Upgrade f_tc_ho_int so that it expects a HANDOVER PERFORMED message

Change-Id: I10f4e578c96a90317939ba49b61b14a3c7e488a7
Depends: osmo-bsc If26e5807280e0f75a423b3b04f8e3c698c82a351
Related: OS#3645
diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index 81cf23e..aaa4580 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -2256,6 +2256,10 @@
 	[] as_handover(hs);
 	}
 
+	/* Since this is an internal handover we expect the BSC to inform the
+	 * MSC about the event */
+	BSSAP.receive(tr_BSSMAP_HandoverPerformed);
+
 	/* Check the amount of MGCP transactions is still consistant with the
 	 * test expectation */
 	f_check_mgcp_expectations()