msc/USSD: add test cases with network-initiaded SS/USSD

This change introduces two new test cases for network-initiaded
USSD notification and network-initiaded USSD request, which are
based on the existing SS/USSD related test cases.

The idea of TC_lu_and_mt_ussd_notification is to verify that
a network-initiaded USSD notification can arrive subscriber in
IDLE mode using Paging procedure.

The idea of TC_lu_and_mt_ussd_during_mt_call is to verify that
a network-initiaded USSD notification can arrive subscriber in
DEDICATED mode (in this case during a call) on a separate
transaction.

Change-Id: I073893c6e11be27e9e36f98f11c1491d0c173985
diff --git a/msc/expected-results.xml b/msc/expected-results.xml
index 9595f17..198b9bd 100644
--- a/msc/expected-results.xml
+++ b/msc/expected-results.xml
@@ -72,5 +72,7 @@
   <testcase classname='MSC_Tests' name='TC_smpp_mt_sms' time='MASKED'/>
   <testcase classname='MSC_Tests' name='TC_lu_imsi_auth_tmsi_encr_3_1_log_msc_debug' time='MASKED'/>
   <testcase classname='MSC_Tests' name='TC_lu_and_mo_ussd_single_request' time='MASKED'/>
+  <testcase classname='MSC_Tests' name='TC_lu_and_mt_ussd_notification' time='MASKED'/>
   <testcase classname='MSC_Tests' name='TC_lu_and_mo_ussd_during_mt_call' time='MASKED'/>
+  <testcase classname='MSC_Tests' name='TC_lu_and_mt_ussd_during_mt_call' time='MASKED'/>
 </testsuite>