GSUP client: send CN domain IE on LU request

Give the HLR a chance to send us updated subscriber data by indicating the CN
domain to be Circuit Switched, only during a LU Request GSUP message.

Adjust msc_vlr_tests to expect the added GSUP CN domain IE to indicate CS, i.e.
append '280102'.

Related: OS#3601
Change-Id: I0c2d33fbfdb4728e480679120d06b7f3a2ccfd76
diff --git a/tests/msc_vlr/msc_vlr_test_reject_concurrency.c b/tests/msc_vlr/msc_vlr_test_reject_concurrency.c
index 580135a..d206571 100644
--- a/tests/msc_vlr/msc_vlr_test_reject_concurrency.c
+++ b/tests/msc_vlr/msc_vlr_test_reject_concurrency.c
@@ -30,7 +30,7 @@
 
 	btw("Location Update Request on one connection");
 	lu_result_sent = RES_NONE;
-	gsup_expect_tx("04010809710000004026f0");
+	gsup_expect_tx("04010809710000004026f0280102");
 	ms_sends_msg("050802008168000130089910070000006402");
 	OSMO_ASSERT(gsup_tx_confirmed);
 	VERBOSE_ASSERT(lu_result_sent, == RES_NONE, "%d");
@@ -73,7 +73,7 @@
 {
 	btw("Location Update Request");
 	lu_result_sent = RES_NONE;
-	gsup_expect_tx("04010809710000004026f0");
+	gsup_expect_tx("04010809710000004026f0280102");
 	ms_sends_msg("050802008168000130089910070000006402");
 	OSMO_ASSERT(gsup_tx_confirmed);
 	VERBOSE_ASSERT(lu_result_sent, == RES_NONE, "%d");