sgsn a54 tests

This adds a few tests that ensure that the encryption algorithm dynamically chosen is
1) one actually supported by both the sgsn and the UE
2) the strongest one available both have in common

Change-Id: Iad65cbf9840aa883cb34e53554b94a4142c82638
Related: SYS#5324
diff --git a/sgsn/expected-results.xml b/sgsn/expected-results.xml
index 0a36e2e..9997895 100644
--- a/sgsn/expected-results.xml
+++ b/sgsn/expected-results.xml
@@ -37,6 +37,11 @@
   <testcase classname='SGSN_Tests' name='TC_attach_rau_a_a' time='MASKED'/>
   <testcase classname='SGSN_Tests' name='TC_attach_rau_a_b' time='MASKED'/>
   <testcase classname='SGSN_Tests' name='TC_attach_usim_resync' time='MASKED'/>
+  <testcase classname='SGSN_Tests' name='TC_attach_usim_a54_a54' time='MASKED'/>
+  <testcase classname='SGSN_Tests' name='TC_attach_usim_a54_a53' time='MASKED'/>
+  <testcase classname='SGSN_Tests' name='TC_attach_usim_a53_a54' time='MASKED'/>
+  <testcase classname='SGSN_Tests' name='TC_attach_usim_a50_a54' time='MASKED'/>
+  <testcase classname='SGSN_Tests' name='TC_attach_usim_a54_a50' time='MASKED'/>
   <testcase classname='SGSN_Tests' name='TC_detach_unknown_nopoweroff' time='MASKED'/>
   <testcase classname='SGSN_Tests' name='TC_detach_unknown_poweroff' time='MASKED'/>
   <testcase classname='SGSN_Tests' name='TC_detach_nopoweroff' time='MASKED'/>