pgw: Introduce test TC_s2b_createSession_v4_apco

Make sure APCO IE is properly handled and answered back.

Change-Id: Ib01fe0512866924a5afc4d6719ceacb0b4b54df2
diff --git a/pgw/expected-results.xml b/pgw/expected-results.xml
index 0e252af..35d0ce9 100644
--- a/pgw/expected-results.xml
+++ b/pgw/expected-results.xml
@@ -8,4 +8,5 @@
   <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'/>
+  <testcase classname='PGW_Tests' name='TC_s2b_createSession_v4_apco' time='MASKED'/>
 </testsuite>