msc/USSD: introduce TC_lu_and_mo_ussd_mo_release

The idea of this test case is to check the reaction of OsmoMSC
on MS-initiated release during an active transaction. In other
words, when the network is waiting for some response from a MS,
subscriber can press the 'red button' in order to terminate
this conversation.

It is expected that the MSC would terminate the transaction
as on DTAP interface, as on GSUP interface.

Change-Id: I7936ed5072ed2ae02f039dc90a1fece1e7f70a70
diff --git a/msc/expected-results.xml b/msc/expected-results.xml
index 198b9bd..296d918 100644
--- a/msc/expected-results.xml
+++ b/msc/expected-results.xml
@@ -75,4 +75,5 @@
   <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'/>
+  <testcase classname='MSC_Tests' name='TC_lu_and_mo_ussd_mo_release' time='MASKED'/>
 </testsuite>