MSC_Tests.ttcn: introduce TC_gsup_mo_sms for MO SMS over GSUP

The idea of this test case is to verify MO SMS transmission
over GSUP towards HLR. Basically, the algorythm is the following:

  1.0 establish a RAN connection,
  2.1 send CP-DATA/RP-DATA on BSSAP/DTAP,
  2.2 expect MO-ForwardSM-Req on GSUP,
  3.1 send MO-ForwardSM-Res on GSUP,
  3.2 expect CP-DATA/RP-ACK on BSSAP/DTAP.

Change-Id: Id14bbd8bd51558cdacefea0fe042769cd69ed5c8
Related: OS#3587
diff --git a/msc/expected-results.xml b/msc/expected-results.xml
index 83c8010..49ca1e3 100644
--- a/msc/expected-results.xml
+++ b/msc/expected-results.xml
@@ -63,6 +63,7 @@
   <testcase classname='MSC_Tests' name='TC_lu_and_mt_sms' time='MASKED'/>
   <testcase classname='MSC_Tests' name='TC_smpp_mo_sms' time='MASKED'/>
   <testcase classname='MSC_Tests' name='TC_smpp_mt_sms' time='MASKED'/>
+  <testcase classname='MSC_Tests' name='TC_gsup_mo_sms' 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'/>