MSC_Tests: add testcase TC_sgsap_impl_imsi_det_eps

We have a testcase that sends an explicit (UE-Initiated) imsi detach
from EPS services. Lets also cover the case for an implicit
(Network-initated) detach.

Change-Id: I63ebc32ae457dd74214d4abee4f511cde28de4a7
Related: OS#3614
diff --git a/msc/expected-results.xml b/msc/expected-results.xml
index e829493..2c0083c 100644
--- a/msc/expected-results.xml
+++ b/msc/expected-results.xml
@@ -74,6 +74,7 @@
   <testcase classname='MSC_Tests' name='TC_sgsap_lu_imsi_reject' time='MASKED'/>
   <testcase classname='MSC_Tests' name='TC_sgsap_lu_and_nothing' time='MASKED'/>
   <testcase classname='MSC_Tests' name='TC_sgsap_expl_imsi_det_eps' time='MASKED'/>
+  <testcase classname='MSC_Tests' name='TC_sgsap_impl_imsi_det_eps' time='MASKED'/>
   <testcase classname='MSC_Tests' name='TC_sgsap_expl_imsi_det_noneps' time='MASKED'/>
   <testcase classname='MSC_Tests' name='TC_sgsap_impl_imsi_det_noneps' time='MASKED'/>
   <testcase classname='MSC_Tests' name='TC_sgsap_paging_rej' time='MASKED'/>