pgw: Introduce test TC_s2b_createSession_v4_no_apco

This test allows initial testing of a session creation through the S2b
interface (emulating an ePDG).

A follow-up test will be added to test the APCO IE (feature which
open5gs-smfd still doesn't support).

Change-Id: I38e469edf0e00feca5a648035b64645e2c905937
diff --git a/pgw/expected-results.xml b/pgw/expected-results.xml
index 0643289..0e252af 100644
--- a/pgw/expected-results.xml
+++ b/pgw/expected-results.xml
@@ -7,4 +7,5 @@
   <testcase classname='PGW_Tests' name='TC_createSession_deleteSession' time='MASKED'/>
   <testcase classname='PGW_Tests' name='TC_deleteSession_unknown' time='MASKED'/>
   <testcase classname='PGW_Tests' name='TC_gy_charging_cc_time' time='MASKED'/>
+  <testcase classname='PGW_Tests' name='TC_s2b_createSession_v4_noapco' time='MASKED'/>
 </testsuite>