TC_act_deact_retrans_duplicate GGSN_Tests

Regression

Failing for the past 1 build since #3188

Took 3 sec (from osmo-ttcn3-hacks_ggsn_tests)

Stack Trace

"GGSN_Tests.ttcn:383 : pingpong T_default timeout"
      GGSN_Tests.ttcn:2468 GGSN_Tests control part
      GGSN_Tests.ttcn:2023 TC_act_deact_retrans_duplicate testcase