hnbgw: Use "NAS/Normal" as default release cause

We shouldn't run all of our tests with a rather exotic release
cause value (O&M intervention) but assume a normal/orderly NAS
triggered release, unless a specific test case explicitly tests
an abnormal release cause.

Change-Id: I8ddd1dccc5637431e3a8c6e607e0e45faa82b5b5
diff --git a/hnbgw/HNBGW_Tests.ttcn b/hnbgw/HNBGW_Tests.ttcn
index 518dee9..808db75 100644
--- a/hnbgw/HNBGW_Tests.ttcn
+++ b/hnbgw/HNBGW_Tests.ttcn
@@ -1054,7 +1054,7 @@
 private template (value) TestHdlrParams
 t_pars(integer imsi_suffix, boolean ps_domain := false, integer hnb_idx := 0,
        boolean expect_separate_sccp_cr := false, integer tx_sccp_cr_data_len := 0,
-       integer cn_nr := 0, template (value) RANAP_IEs.Cause rab_rel_cause := ts_RanapCause_om_intervention) := {
+       integer cn_nr := 0, template (value) RANAP_IEs.Cause rab_rel_cause := ts_RanapCause_nas_normal) := {
 	hnb_idx := hnb_idx,
 	cn_idx := f_cn_idx(ps_domain, cn_nr),
 	imsi := f_gen_imsi(imsi_suffix),
@@ -1477,7 +1477,7 @@
 	g_num_hnbs := 1;
 	f_init();
 
-	vc_conn := f_start_handler_with_pars(refers(f_tc_rab_assign_fail), t_pars(4));
+	vc_conn := f_start_handler_with_pars(refers(f_tc_rab_assign_fail), t_pars(4, rab_rel_cause := ts_RanapCause_radio_conn_lost));
 	vc_conn.done;
 
 	f_shutdown_helper();