bsc: make TC_stats_conn_fail less fragile

Add a delay between sending the RSL Conn Fail IND and checking the stats
values, so that osmo-bsc has a good chance of receiving the message and
promoting the failure into the stats values first.

Even though jenkins shows no failures, when testing locally, this test
fails a lot for me without that bit of delay.

Change-Id: Iaf0173239528337283b23f70840d36ad25f14950

bsc/BSC_Tests.ttcn

@@ -1804,6 +1804,8 @@ private function f_TC_stats_conn_fail(charstring id) runs on MSC_ConnHdlr {
 			ts_RSL_CONN_FAIL_IND(g_chan_nr, RSL_ERR_RADIO_LINK_FAIL),
 			IPAC_PROTO_RSL_TRX0));
 
+	f_sleep(1.0);
+
 	/* Expect stats to be 1 */
 	expect := {
 		{name := "TTCN3.bts.0.chan.rf_fail", mtype := "c", min := 1, max := 1},