sgsn: Introduce test TC_attach_req_id_req_ra_update

The scenario in this test triggers a crash in osmo-sgsn fixed by
osmo-sgsn.git I64fa5cf1b427d3abb99e553e584897261a827ce6.

With that osmo-sgsn patch applied, the process doesn't crash anymore but
the test still fails due to an XID message being sent with a new
yet-not-seen-by-ttcn3 TLLI and as a result TTCN3 BSSGP_Emulation fails:
BSSGP_Emulation.ttcn:390 setverdict(fail): none -> fail reason: "Couldn't find Component for TLLI 'FE791757'O", new component reason: "Couldn't find Component for TLLI 'FE791757'O"

Other than that, the test runs fine. It still needs to be clarified
whether the new TLLI sent by osmo-sgsn is expected and test needs to be
fixed, or whether it's an sgsn bug.

Related: OS#3957, OS#4245
Change-Id: Id5554a91a8bda712e282c5a3e9e30fb0ca1ec0e8
diff --git a/sgsn/expected-results.xml b/sgsn/expected-results.xml
index fc8856a..8381064 100644
--- a/sgsn/expected-results.xml
+++ b/sgsn/expected-results.xml
@@ -62,4 +62,5 @@
   <testcase classname='SGSN_Tests' name='TC_attach_pdp_act_deact_gtp_retrans_resp' time='MASKED'/>
   <testcase classname='SGSN_Tests' name='TC_attach_pdp_act_user_error_ind_ggsn' time='MASKED'/>
   <testcase classname='SGSN_Tests' name='TC_attach_gmm_attach_req_while_gmm_attach' time='MASKED'/>
+  <testcase classname='SGSN_Tests' name='TC_attach_req_id_req_ra_update' time='MASKED'/>
 </testsuite>